Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Weighted average remaining contractual life, unvested shares outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted-Average Remaining Contractual Term Accelerated Share Repurchases, Initial Price Paid Per Share Accelerated Share Repurchases, Initial Price Paid Per Share Schedule of Finite and Indefinite lived Intangible Assets by Segment [Table] Schedule Of Finite And Indefinite Lived Intangible Assets By Segment [Table] -- None. No documentation exists for this element. -- Net increase (decrease) in Warehouse facilities Net increase (decrease) in Warehouse facilities Net increase (decrease) in Warehouse facilities Servicing Asset at Amortized Cost, Other than Temporary Impairments Servicing Asset at Amortized Cost, Other than Temporary Impairments Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus Derivative Liability, Fair Value, Gross Asset Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Derivative Assets (Liabilities), at Fair Value, Net Derivative Assets (Liabilities), at Fair Value, Net, Beginning Balance Derivative Assets (Liabilities), at Fair Value, Net, Ending Balance Derivative Assets (Liabilities), at Fair Value, Net Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Platform operating, administrative and other Platform operating, administrative and other Platform operating, administrative and other Share-based Payment activity [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Future Amortization Expense for Finite-Lived Intangible Assets Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Restructuring Plan [Axis] Restructuring Plan [Axis] Common stock, $.01 par value per share Common Stock, Value, Issued BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] -- None. No documentation exists for this element. -- Accrued compensation & benefits Employee-related Liabilities, Current Summary of Earn-out Payments [Table Text Block] Summary of Earn-out Payments [Table Text Block] [Table Text Block] for Summary of Earn-out Payments [Table] Loss Contingency Accrual Loss Contingency Accrual Loss Contingency Accrual Business Combination, Integration-Related Cost, Expense Business Combination, Integration-Related Cost, Expense Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Line of Credit [Member] Line of Credit [Member] Line of Credit [Member] Restatement Determination Date Restatement Determination Date Investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Contract with Customer, Asset, after Allowance for Credit Loss Contract with Customer, Asset, after Allowance for Credit Loss Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Measurement Frequency [Axis] Measurement Frequency [Axis] Other Payments to Acquire Businesses Other Payments to Acquire Businesses Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Goodwill, Divestiture Goodwill, Divestiture Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Restructuring and acquisition charges Restructuring and acquisition charges Restructuring Costs and Asset Impairment Charges Current liabilities: Liabilities, Current [Abstract] Provision for loss on receivables and other assets Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Notional Amounts of Outstanding Derivative Positions Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Joseph (Larry) Quinlan [Member] Joseph (Larry) Quinlan Change in pension liabilities, net of tax (SoE QTD) Change in pension liabilities, net of tax (SoE QTD) Change in pension liabilities, net of tax (SoE QTD) Loss Contingencies [Table] Loss Contingencies [Table] Payment for Origination, Loan, Mortgage, Held-for-Sale Payment for Origination, Loan, Mortgage, Held-for-Sale Net investment activity (less than wholly-owned) Net investment activity (less than wholly-owned) Net investment activity (less than wholly-owned). Acquisition of investment properties less the proceeds from the sale of assets Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Increase (Decrease) in Income taxes receivable, payable and deferred Increase (Decrease) in Deferred Income Taxes Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Entity Address, State or Province Entity Address, State or Province Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount Loss Contingency, Receivable Loss Contingency, Receivable Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Noncurrent liabilities: Liabilities, Noncurrent [Abstract] Identified intangibles, net of accumulated amortization Net book value as of end of period Intangible Asset, Excluding Goodwill, after Accumulated Amortization Unvested at beginning of period (in shares) Unvested at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Derivative, Notional Amount Derivative, Notional Amount Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Contract with Customer, Asset, after Allowance for Credit Loss, Current Contract with Customer, Asset, after Allowance for Credit Loss, Current Capital Markets Services Capital Markets Services [Member] Capital Markets Services [Member] Restricted Stock Unit and Performance Stock Unit Activity Share-Based Payment Arrangement, Activity [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Investments in Real Estate Ventures, at Fair Value, Additions Investments in Real Estate Ventures, at Fair Value, Additions Investments in Real Estate Ventures, at Fair Value, Additions Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total current liabilities Liabilities, Current Number of Reportable Segments Number of Reportable Segments EMEA [Member] EMEA [Member] Schedule of Derivative Assets at Fair Value Schedule of Derivative Assets at Fair Value [Table Text Block] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Loan subject to loss-sharing arrangements, aggregate unpaid principal amount Loan subject to loss-sharing arrangements, aggregate unpaid principal amount Loan subject to loss-sharing arrangements, aggregate unpaid principal amount Entity Address, City or Town Entity Address, City or Town Derivative, Fair Value, Net Derivative, Fair Value, Net Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Commercial Paper Commercial Paper Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Schedule of Business Acquisitions, Pro Forma Revenue [Table] Schedule of Business Acquisitions, Pro Forma Revenue [Table] Schedule of Business Acquisitions, Pro Forma Revenue [Table] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Intangible Asset, Finite-Lived, after Accumulated Amortization Total Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net income attributable to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Fair Value, Qualitative Disclosures About Assets and Liabilities using Unobservable Inputs Schedule of Changes in Fair Value of Plan Assets [Table Text Block] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Identified intangibles, with finite useful lives, accumulated amortization Identified intangibles, with finite useful lives, accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Long-term Debt, Current Maturities Long-Term Debt, Current Maturities Net non-cash MSR and mortgage banking derivative activity Net non-cash MSR and mortgage banking derivative activity Net non-cash MSR and mortgage banking derivative activity Business Line[Axis] Business Line [Axis] Business Line [Axis] Other Restructuring [Member] Other Restructuring [Member] Investments in real estate ventures, Fair Value Schedule of Investments [Text Block] Location, Statement of Other Comprehensive Income, Balance [Axis] Location, Statement of Other Comprehensive Income, Balance [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Software and Technology Solutions Software and Technology Solutions [Member] Software and Technology Solutions Treasury Stock, Value Treasury Stock, Value New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Contract Termination and Other Charges Contract Termination and Other Charges [Member] Contract Termination and Other Charges Summarized Unaudited Financial Information by Business Segments Segment Reporting [Table Text Block] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Non-cash activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Net non-cash mortgage servicing rights and mortgage banking derivative activity Net non-cash mortgage servicing rights and mortgage banking derivative activity Net non-cash mortgage servicing rights and mortgage banking derivative activity Proceeds from (Repayments of) Short-term Debt Net borrowings (repayments) of short-term borrowings Net borrowings (repayments) of short-term borrowings Document Period End Date Document Period End Date Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Debt Instrument, Face Amount Debt Instrument, Face Amount Security Exchange Name Security Exchange Name Segment Reporting, Reconciliation of Revenue by Segment to Consolidated Segment Reporting, Reconciliation of Revenue by Segment to Consolidated [Table Text Block] Distributions to noncontrolling interest Noncontrolling Interest, Period Increase (Decrease) Loan loss incurred [Abstract] Loan loss expense Loan loss expense Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] Schedule Of Finite And Indefinite Lived Intangible Assets By Segment [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Agreement expires October 22, 2026, Extension Agreement expires October 22, 2026, Extension [Member] Agreement expires October 22, 2026 Extension Total liabilities at fair value Liabilities, Fair Value Disclosure Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Cash Payments For Current & Prior Period Acquisitions Cash Payments For Current & Prior Period Acquisitions Cash Payments For Current & Prior Period Acquisitions; encompasses cash consideration paid in addition to cash payments related to guaranteed deferred and earn out obligations. Acquisition of controlling interest, net of cash acquired Acquisition of controlling interest, net of cash acquired Acquisition of controlling interest, net of cash acquired Operating Lease, Liability, Current Operating Lease, Liability, Current Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Geographical [Domain] Identifiable intangibles with indefinite useful lives Intangible Asset, Excluding Goodwill, Indefinite-Lived Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Foreign currency forward contracts, net notional value Foreign Currency Forward Contract Net Notional Value Foreign Currency Forward Contract Net Notional Value Notional amount of foreign currency exchange rate derivatives, on a net basis. Redeemable Noncontrolling Interest, Acquisition Date Fair Value Redeemable Noncontrolling Interest, Acquisition Date Fair Value Redeemable Noncontrolling Interest, Acquisition Date Fair Value Notes and other receivables Financing Receivable, after Allowance for Credit Loss, Current Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Member] Other Investments and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Proceeds from Divestiture of Businesses, Net of Cash Divested Proceeds from Divestiture of Businesses, Net of Cash Divested Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Bank Overdrafts Bank Overdrafts Summary of Earn-out Payments [Table] Summary of Earn-out Payments [Table] Summary of Earn-out Payments [Table] Loan Servicing Loan Servicing [Member] Loan Servicing Asset Class [Domain] Asset Class [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Credit Facility [Domain] Credit Facility [Domain] Business acquisitions, including contingent consideration Business Combination, Consideration Transferred, Tangible and Intangible Assets, Excluding Cash Business Combination, Consideration Transferred, Tangible and Intangible Assets, Excluding Cash Cash flows used for operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Loss Contingency Accrual, Provision Adjustment Loss Contingency Accrual, Provision Adjustment Loss Contingency Accrual, Provision Adjustment Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Line of Credit Facility [Table] Line of Credit Facility [Table] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Underlying Security Market Price Change Underlying Security Market Price Change, Percent Finite and Indefinite lived Intangible Assets, Additions Finite and Indefinite lived Intangible Assets, Additions The additions, occurring during the reporting period, to the gross value of finite and indefinite-lived intangible assets. Commercial Paper Commercial Paper [Member] Summarized Investment balances Summarized Investment balances [Table Text Block] Summarized Investment balances Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Total Short-term Debt Short-Term Debt Contract with Customer, Asset, Allowance for Credit Loss, Current Contract with Customer, Asset, Allowance for Credit Loss, Current Derivative Liability, Fair Value, Gross Liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Operating, administrative and other Other General and Administrative Expense Other Intangible Assets [Member] Other Intangible Assets [Member] Noncontrolling interest (distributions) contributions, net Noncontrolling interest (distributions) contributions, net Noncontrolling interest (distributions) contributions, net Proceeds from Issuance of Commercial Paper Proceeds from Issuance of Commercial Paper Operating Lease, Payments Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock, Common Treasury Stock, Common [Member] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Amortization of stock compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Software and Technology Solutions Proptech Investments [Member] Proptech Investments Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Weighted average grant date fair value, beginning of period (in dollars per share) Weighted average grant date fair value, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Repayments of Long-term Lines of Credit Repayments of Long-Term Lines of Credit Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Fair value of long-term debt Long-Term Debt, Fair Value Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Impact of exchange rate movements Accumulated Amortization Finite Lived Intangible Assets Translation Adjustments The increase (decrease) to the recorded value of accumulated amortization of finite-lived intangible assets for foreign currency translation adjustments. Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Restricted Cash, beginning of period Restricted Cash, beginning of period Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with bank or financial institutions, and other accounts with general characteristics of demand deposits Long-term debt, net of debt issuance costs Senior Notes, Noncurrent Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Business Segments Segment Reporting [Text Block] Expiration Date Trading Arrangement Expiration Date Investments, Fair Value Disclosure Fair value investments at beginning of the period Fair value investments at end of the period Investments, Fair Value Disclosure Hedging Relationship [Axis] Hedging Relationship [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Liabilities Liabilities [Abstract] Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Americas [Member] Americas [Member] Total equity Balances Balances Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Increase (Decrease) in Reimbursable Receivables and Reimbursable Payables Increase (Decrease) in Reimbursable Receivables and Reimbursable Payables The increase (decrease) during the reporting period to reimbursable receivables and payables. Derivative [Member] Derivative [Member] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Business Combination [Line Items] Business Combination [Line Items] Investments previously accounted at cost that are now being accounted for at Net Asset value Investments previously accounted at cost that are now being accounted for at Net Asset value Investments previously accounted for at cost that are now being accounted for at Net Asset value Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Deferred Compensation Plan Assets Deferred Compensation Plan Assets Adjustment for fully amortized intangibles Adjustment for fully amortized intangibles Adjustment for fully amortized intangibles. Schedule of Carrying Values and Estimated Fair Values of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Cash flows used in investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Unamortized deferred compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Shares held in trust Common Stock, Held-in-Trust Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Segments [Domain] Accelerated Share Repurchases, Final Price Paid Per Share Accelerated Share Repurchases, Final Price Paid Per Share Warehouse facilities Warehouse Agreement Borrowings Debt Debt Disclosure [Text Block] Contract with Customer, Asset, Allowance for Credit Loss Contract with Customer, Asset, Allowance for Credit Loss Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Restructuring reserve, beginning balance Restructuring reserve, ending balance Restructuring Reserve Earn-out Liabilities [Member] Earn-out Liabilities [Member] Earn-out Liabilities [Member] Business Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] Quarterly Financial Information Disclosure [Abstract] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Loans Receivable, Fair Value Disclosure Loans Receivable, Fair Value Disclosure Foreign currency forward contract, current asset amount Foreign currency forward contracts receivable Foreign Currency Contract, Asset, Fair Value Disclosure Foreign Exchange Contract [Member] Foreign Exchange Contract [Member] Adoption Date Trading Arrangement Adoption Date Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Text Block [Abstract] Text Block [Abstract] Total Company shareholders' equity Equity, Attributable to Parent Restructuring Cost and Reserve [Axis] Restructuring Type [Axis] Assets Assets Assets [Abstract] Out of Scope of Topic 606 Revenue [Member] Out of Scope of Topic 606 Revenue [Member] Out of Scope of Topic 606 Revenue [Member] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Number Of Acquisitions Subject To Potential Earn Out Payments Provisions Number Of Acquisitions Subject To Potential Earn Out Payments Provisions The number of acquisitions subject to potential earn-out payment provisions. Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Other, net Proceeds from (Payment for) Other Financing Activity Trade receivables, allowances Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance Shares [Member] Performance Shares [Member] Schedule of Warehouse Facilities Schedule of Line of Credit Facilities [Table Text Block] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current Business Line [Domain] Business Line [Domain] [Domain] for Business Line [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Business Combination [Domain] Business Combination [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Movements in Goodwill by Reporting Segment Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Property and equipment, accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Other Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Warehouse Agreement Borrowings [Member] Warehouse Agreement Borrowings [Member] Business Combination [Axis] Business Combination [Axis] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accounts Receivable, Reimbursed by Client, Current Accounts Receivable, Reimbursed by Client, Current Accounts Receivable, Reimbursed by Client, Current Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Income Statement [Abstract] Income Statement [Abstract] Company shareholders' equity: Company shareholders' equity Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Equity Method Investment, Equity Method Investee, Name [Axis] Investment, Name [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Operating expenses: Operating Expenses [Abstract] Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Short-term contract liabilities and deferred income Deferred Revenue, Current Basis spread on variable rate (in hundredths) Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Schedule of Loss Contingencies by Contingency [Table Text Block] Schedule of Loss Contingencies by Contingency [Table Text Block] Name Forgone Recovery, Individual Name Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Loss Contingency Accrual [Roll Forward] Loss Contingency Accrual [Roll Forward] Business Combination, Contingent Consideration, Liability, Noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Loan loss accrual Loan loss accrual Loan loss accrual Agreement expires September 11, 2026, Extension [Member] Agreement expires September 11, 2026, Extension [Member] Agreement expires September 11, 2026, Extension [Member] Share-based Payment activity, additional disclosures [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Deferred compensation plan, contra-equity, shares held in trust Common Stock Issued, Employee Stock Trust Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Stock-based Compensation Share-Based Payment Arrangement [Text Block] Restricted Cash, end of period Restricted Cash, end of period Amount of cash restricted as to withdrawl or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) Intangible Asset, Excluding Goodwill, Indefinite-Lived, Impairment Loss Foreign currency forward contracts, gross notional value and net basis Foreign currency forward contracts, gross notional value and net basis [Table Text Block] Foreign currency forward contracts, gross notional value and net basis Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Deferred compensation plan liabilities Defined Benefit Plan, Benefit Obligation PEO PEO [Member] Movements in Gross Carrying Amount and Accumulated Amortization of Finite-Lived Intangible Assets Schedule of Finite and Indefinite lived Intangible Assets by Segment [Table Text Block] Tabular disclosure of finite- and indefinite-lived intangible assets by segment and the changes during the year to gross carrying amount and accumulated amortization. Debt, Long-term and Short-term, Combined Amount Debt, Long-Term and Short-Term, Combined Amount Derivative Asset, Fair Value, Gross Liability Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Other Other Liabilities, Noncurrent Goodwill Goodwill Goodwill Goodwill Long-term senior notes, 6.875%, due December 2028 Long-term senior notes, 6.875%, due December 2028 [Member] Long-term senior notes, 6.875%, due December 2028 Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Goodwill, Acquired During Period Goodwill, Acquired During Period Adjusted EBITDA Adjusted EBITDA Adjusted EBITDA Proceeds from Real Estate and Real Estate Joint Ventures Proceeds from Real Estate and Real Estate Joint Ventures Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Retained Earnings [Member] Retained Earnings [Member] Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Warehouse Facilities [Abstract] Warehouse Facilities [Abstract] Warehouse Facilities [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Fees and Commissions, Mortgage Banking and Servicing Fees and Commissions, Mortgage Banking and Servicing Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Prepaid Expense and Other Assets Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments Platform compensation and benefits Platform compensation and benefits Platform compensation and benefits Schedule of Business Acquisitions, Pro Forma Revenue [Line Items] Schedule of Business Acquisitions, Pro Forma Revenue [Line Items] [Line Items] for Schedule of Business Acquisitions, Pro Forma Revenue [Table] Amortization expense Intangible Asset, Finite-Lived, Amortization Expense Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility, by type [Axis] Line of Credit Facility, by type [Axis] Pertinent information about borrowings under facilities, by type. Proceeds from Long-term Lines of Credit Proceeds from Long-Term Lines of Credit Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Intangible Asset, Finite-Lived, Acquired Deferred compensation Deferred Compensation Liability, Classified, Noncurrent Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Line of Credit Facility, by type [Domain] Line of Credit Facility, by type [Domain] Identification of borrowings under facilities, by type. Cash flows provided by financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property and equipment, net of accumulated depreciation Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Document and Entity Information [Abstract] Document and Entity Information [Abstract] -- None. No documentation exists for this element. -- Line of Credit, Current Line of Credit, Current Interest on employee loans, net Interest on employee loans, net Interest on employee loans, net Segment revenue: Segment Reporting, Revenue [Abstract] Investments in Real Estate Ventures, at Fair Value, Distributions Investments in Real Estate Ventures, at Fair Value, Distributions Investments in Real Estate Ventures, at Fair Value, Distributions Payments to Acquire Interest in Joint Venture Payments to Acquire Interest in Joint Venture Financial Instruments [Domain] Financial Instruments [Domain] Contract Termination [Member] Contract Termination [Member] Restructuring Charges and Related Payment Activity Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Vesting of shares related to equity compensation plans, net of amounts withheld for payment of taxes Vesting of shares related to equity compensation plans, net of amounts withheld for payment of taxes Vesting of shares related to equity compensation plans, net of amounts withheld for payment of taxes Mortgage banking derivative asset Derivative Asset Redeemable Noncontrolling Interest [Domain] Redeemable Noncontrolling Interest [Domain] [Domain] for Redeemable Noncontrolling Interest [Axis] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Contract Asset & Liability [Abstract] Contract Asset & Liability [Abstract] Contract Asset & Liability [Abstract] Underlying Securities Award Underlying Securities Amount Proceeds from Sale and Collection, Loan, Held-for-Sale Proceeds from Sale and Collection, Loan, Held-for-Sale Intangible Asset, Excluding Goodwill, before Accumulated Amortization Intangible Asset, Excluding Goodwill, before Accumulated Amortization Revenue from Contract with Customer [Text Block] Revenue from Contract with Customer [Text Block] Foreign currency forward contract, current liability amount Foreign currency forward contracts payable Foreign Currency Contracts, Liability, Fair Value Disclosure Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Abstract] Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Abstract] Accelerated Share Repurchases, Settlement (Payment) or Receipt Accelerated Share Repurchases, Settlement (Payment) or Receipt Other, net Payment for (Proceeds from) Other Investing Activity Segment Reporting [Table] Segment Reporting [Table] Loan loss guarantee reserve Loan loss guarantee reserve contingent reserve for loss sharing program Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Business Combination, Contingent Consideration, Liability, Current Business Combination, Contingent Consideration, Liability, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating Income (Loss) Operating Income (Loss) Asia Pacific [Member] Asia Pacific [Member] Current Fiscal Year End Date Current Fiscal Year End Date Gain (Loss) on Disposition of Business Gain (Loss) on Disposition of Business Deferred compensation plan assets Deferred Compensation Plan Assets, Fair Value Disclosure Deferred Compensation Plan Assets, Fair Value Disclosure Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Number of separate property or fund co-investments Number Of Separate Property Or Fund Co Investments Number of separate property or fund co-investments. Real Estate Management Services Real Estate Management Services [Member] Real Estate Management Services Restructuring reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Shares issued under stock compensation programs Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Thereafter Intangible Asset, Finite-Lived, Estimated Amortization Expense, after Year Five Conversion Gains and Losses on Foreign Investments Conversion Gains and Losses on Foreign Investments Asset, Impairment Loss Asset, Impairment Loss Workplace Management Workplace Management [Member] Workplace Management Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior Notes Senior Notes Common Stock, Shares, Issued Common Stock, Shares, Issued Measure: Measure [Axis] Investments in Real Estate Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Treasury Stock, Common, Shares Treasury Stock, Common, Shares Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Forward Contracts Forward Contracts [Member] Accumulated Other Comprehensive Income (Loss) by Component Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Income taxes, net of refunds Income Tax Paid, after Refund Received Schedule of Foreign Exchange Contracts, Statement of Financial Position Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Loans Receivable, Gross, Mortgage Warehouse Lending. Loans Receivable, Gross, Mortgage Warehouse Lending. Loans Receivable, Gross, Mortgage Warehouse Lending. (Increase) Decrease In Common Stock Held In Trust Increase Decrease In Common Stock Held In Trust (Increase) decrease in the value of common stock held in trust. Deferred Tax Liabilities, Net Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current Entity Small Business Entity Small Business Comprehensive income attributable to the common shareholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Uncommitted Facility, Maximum Borrowing Capacity Uncommitted Facility, Maximum Borrowing Capacity Uncommitted Facility, Maximum Borrowing Capacity Leasing Advisory Leasing Advisory [Member] Leasing Advisory Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Business Combinations, Goodwill and Other Intangible Assets [Table] Business Combinations, Goodwill and Other Intangible Assets [Table Text Block] Business Combinations, Goodwill and Other Intangible Assets Interest Expense, Net of Interest Income Interest Expense, Net of Interest Income Interest Income (Expense), Operating MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other Other Liabilities, Current Other Other Assets, Noncurrent Document Type Document Type Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Depreciation and amortization adjusted Depreciation and amortization adjusted Depreciation and amortization adjusted to exclude the noncontrolling interest portion of amortization of acquisition-related intangibles which is not attributable to common shareholders. Fair Value as of Grant Date Award Grant Date Fair Value Portfolio Services and Other Portfolio Services and Other [Member] Portfolio Services and Other Schedule of Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Intangible Asset, Excluding Goodwill, Impairment Loss Intangible Asset, Excluding Goodwill, Impairment Loss Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Registrant Name Entity Registrant Name Entity Address, Postal Zip Code Entity Address, Postal Zip Code Amortization of Deferred Compensation Amortization of Other Deferred Charges Net Investment Hedging Net Investment Hedging [Member] Mortgage servicing rights [Member] Mortgage servicing rights [Member] Mortgage servicing rights [Member] Income before income taxes and noncontrolling interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Revenue Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2024 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Equity earnings from real estate ventures Equity in (earnings) losses Equity in earnings (losses) Income (Loss) from Equity Method Investments Increase (Decrease) in Accounts Payable, Accrued Liabilities and Other Liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Goodwill [Roll Forward] Goodwill [Roll Forward] Liabilities and Equity Liabilities and Equity Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Long-term senior notes, Euro notes, 2.21%, due June 2029 [Member] Long-term senior notes, Euro notes, 2.21%, due June 2029 [Member] Long-term senior notes, Euro notes, 2.21%, due June 2029 [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] 2021 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Treasury Stock, Shares, Acquired Stock Repurchased During Period, Shares Treasury Stock, Shares, Acquired PEO Name PEO Name Geographical [Axis] Geographical [Axis] Geographical [Axis] Other Short-term Borrowings Other Short-Term Borrowings Contract with Customer, Liability Contract with Customer, Liability Fair Value Measured at Net Asset Value Per Share [Member] Fair Value Measured at Net Asset Value Per Share [Member] Line of Credit Facility, Interest Rate During Period Line of Credit Facility, Interest Rate During Period Segment Reporting, Other Segment Item, Amount Segment Reporting, Other Segment Item, Amount Payment for Contingent Consideration Liability, Financing Activities Payment for Contingent Consideration Liability, Financing Activities Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Payments made Payments for Restructuring Foreign currency translation adjustments (SoE QTD) Foreign currency translation adjustments (SoE QTD) Foreign currency translation adjustments (SoE QTD) Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived [Table Text Block] Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived [Table Text Block] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Long-term receivables Accounts and Financing Receivable, after Allowance for Credit Loss, Noncurrent Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Fair Value [Abstract] Fair Value [Abstract] -- None. No documentation exists for this element. -- Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Interim Information Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Measurement Frequency [Domain] Measurement Frequency [Domain] Share-based Payment Arrangement, Noncash Expense Share-Based Payment Arrangement, Noncash Expense Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Pricing on the Facility based on market rates Line of Credit Facility, Interest Rate Description Business Combinations, Goodwill and Other Intangible Assets Business Combinations, Goodwill and Other Intangible Assets [Text Block] The entire disclosure pertaining to business combinations, goodwill and other intangible assets. Shares Held in Trust [Member] Shares Held in Trust [Member] Shares held in trust. 2022 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Compensation and benefits Labor and Related Expense Finite And Indefinite Lived Intangible Assets Translation Adjustments Finite And Indefinite Lived Intangible Assets Translation Adjustments The increase (decrease) to the gross recorded value of finite and indefinite-lived intangible assets for foreign currency translation adjustments. Schedule of Debt [Table Text Block] Schedule of Debt [Table Text Block] Gain (Loss) on Sale of Assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Equity Method Investee, Name [Domain] Investment, Name [Domain] Customer [Domain] Customer [Domain] Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Total current assets Assets, Current Insider Trading Arrangements [Line Items] Accelerated Share Repurchases, Cash or Stock Settlement Accelerated Share Repurchases, Cash or Stock Settlement Derivative Instruments, Gain (Loss) Derivative Instruments, Gain (Loss) [Table Text Block] Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Trade receivables, net of allowances Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Repayments of Commercial Paper Repayments of Commercial Paper Product and Service [Axis] Product and Service [Axis] Level of risk retained (per claim) Level of risk retained (per claim) The per claim amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date. Payment for Contingent Consideration Liability, Total Payment for Contingent Consideration Liability, Total Payment for Contingent Consideration Liability, Total Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock [Member] Common Stock [Member] Indefinite-lived Intangible Assets [Axis] Redeemable Noncontrolling Interest [Axis] Redeemable Noncontrolling Interest [Axis] Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability, Beginning Balance Business Combination, Contingent Consideration, Liability, Ending Balance Business Combination, Contingent Consideration, Liability Severance [Member] Employee Severance [Member] Cover Table [Abstract] Cover Table [Abstract] Cover Table [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Summary of Earn-out Payments [Line Items] Summary of Earn-out Payments [Line Items] [Line Items] for Summary of Earn-out Payments [Table] Fannie Mae ASAP program [Member] Fannie Mae ASAP program [Member] Fannie Mae ASAP program [Member] Derivative Contract Type [Domain] Derivative Contract [Domain] Cash paid during the period for: Cash Paid During Period For [Abstract] -- None. No documentation exists for this element. -- Goodwill, Translation Adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Business Combination, Number of Businesses Acquired Business Combination, Number of Businesses Acquired Total liabilities and equity Liabilities and Equity Goodwill Additions, net of adjustments Goodwill Additions, net of adjustments The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. Also includes purchase price allocation adjustment for allocations not yet complete at the prior year end. Restructuring, Impairment, and Other Activities Disclosure [Text Block] Restructuring, Impairment, and Other Activities Disclosure [Text Block] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Noncontrolling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Value and Risk Advisory Valuation Advisory [Member] Valuation Advisory Asset Class [Axis] Asset Class [Axis] Restructuring charges Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Loss Contingency Accrual, Loss (Reversal of Loss) Loss Contingency Accrual, Loss (Reversal of Loss) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) 2025 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Five 2023 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three 2020 (3 months) Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Insurance Claims [Member] Insurance Claims [Member] Line of Credit Facility, Average Outstanding Amount Line of Credit Facility, Average Outstanding Amount Investment Management Investment Management [Member] Information pertaining to the LaSalle Investment Management product category. Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Credit losses on convertible note investments Credit losses on convertible note investments Credit losses on convertible note investments Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Derivatives and Fair Value Derivatives and Fair Value [Text Block] Advisory Fees Advisory Fees [Member] Advisory Fees [Member] Short-term Debt Short term Debt Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year of the normal operating cycle, if longer. Excluding Warehouse facilities Equity earnings (losses) - Investment Management and Software and Technology Solutions Equity earnings (losses) - Investment Management and Software and Technology Solutions Equity earnings (losses) - Investment Management and Software and Technology Solutions Adjustment to Compensation: Adjustment to Compensation [Axis] Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Increase (Decrease) in Accrued Compensation Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Hedging Designation [Domain] Hedging Designation [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest Paid, Excluding Capitalized Interest, Operating Activity Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Agreement expires September 14, 2026, Extension [Member] Agreement expires September 14, 2026, Extension [Member] Agreement expires September 14, 2026, Extension [Member] Hedging Designation [Axis] Hedging Designation [Axis] Restructuring and Related Activities Disclosure [Text Block] Restructuring and Related Activities Disclosure [Text Block] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets at fair value Assets, Fair Value Disclosure Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Operating Segment Other Operating Segment [Member] Accounts Payable, Reimbursed by Client, Current Accounts Payable, Reimbursed by Client, Current Accounts Payable, Reimbursed by Client, Current Debt Instrument [Line Items] Debt Instrument [Line Items] Project Management Project Management [Member] Project Management Schedule of Credit Facility, Average Outstanding Amount [Table Text Block] Schedule of Credit Facility, Average Outstanding Amount [Table Text Block] Schedule of Credit Facility, Average Outstanding Amount [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Estimated loss on loan repurchase Estimated loss on loan repurchase Estimated loss on loan repurchase Accumulated Amortization Adjustment for fully Amortized Intangibles Accumulated Amortization Adjustment for fully Amortized Intangibles Accumulated Amortization Adjustment for fully Amortized Intangibles Property Management Property Management [Member] Property Management Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Deferred business acquisition obligations Business Combinations, Guaranteed Deferred Acquisition Obligation Business Combinations, Guaranteed Deferred Acquisition Obligation Business Combinations, Guaranteed Deferred Acquisition Obligation Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs Company Selected Measure Amount Company Selected Measure Amount Distributions of earnings from real estate ventures Proceeds from Equity Method Investment, Distribution Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Line of Credit, Gross [Member] Line of Credit, Gross [Member] Line of Credit, Gross [Member] Equity Investments accounted for under the measurement alternative Equity Investments accounted for under the measurement alternative Equity Investments accounted for under the measurement alternative Shares issued under stock compensation programs (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Current assets: Assets, Current [Abstract] Mortgage banking derivative liabilities Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Long-Term Senior Notes [Member] Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Weighted average grant date fair value, vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Loss Contingency Accrual, Payments Loss Contingency Accrual, Payments Adjustments to reconcile net income to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) [Abstract] Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) [Abstract] Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) [Abstract] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Accretion of interest and amortization of debt issuance costs Accretion Expense Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Investments [Member] Investments [Member] Unamortized Debt Issuance Expense Unamortized Debt Issuance Expense Statement [Table] Statement [Table] Shares Outstanding (SoE QTD) Shares Outstanding (SoE QTD) [Member] Shares Outstanding (SoE QTD) Restatement Determination Date: Restatement Determination Date [Axis] Investment Sales, Debt/Equity Advisory and Other Investment Sales, Debt/Equity Advisory and Other [Member] Investment Sales, Debt/Equity Advisory and Other Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Derivative, Fair Value, Net (Liability) Derivative, Fair Value, Net (Liability) Derivative, Fair Value, Net (Liability) Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Schedule of Deferred Compensation Plan Components [Table] Schedule of Deferred Compensation Plan Components [Table Text Block] Schedule of Deferred Compensation Plan Components Increase (Decrease) in Receivables Increase (Decrease) in Receivables Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Net capital additions - property and equipment Payments for (Proceeds from) Productive Assets Contract with Customer, Asset, before Allowance for Credit Loss Contract with Customer, Asset, before Allowance for Credit Loss Long-term senior notes, Euro notes, 1.96%, due June 2027 [Member] Long-term senior notes, Euro notes, 1.96%, due June 2027 [Member] Long-term senior notes, Euro notes, 1.96%, due June 2027 [Member] Share-based Payment Arrangement [Member] Share-Based Payment Arrangement [Member] Business Combination, Contingent Consideration Arrangements, Range of Outcomes, High, Value Business Combination, Contingent Consideration Arrangements, Range of Outcomes, High, Value Business Combination, Contingent Consideration Arrangements, Range of Outcomes, High, Value Gross contract costs Gross contract costs Gross contract costs Incentive and transaction fees Incentive and transaction fees [Member] Incentive and transaction fees [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]