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Number of defendants Loss Contingency, Number of Defendants Summary of Activities Related to Investments Debt Securities, Available-for-Sale [Table Text Block] Investments [Domain] Investments [Domain] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Total non-current liabilities Total non-current liabilities Liabilities, Noncurrent Business acquisitions Stock Issued During Period, Value, Acquisitions Certified Deposits and Other Depository Assets Certified Deposits And Other Depository Assets [Member] Certified deposits and other depository assets. 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Lease liabilities Operating Lease, Liability, Current Trade accounts receivable Billed Contracts Receivable Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings per share: Earnings Per Share [Abstract] 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] Number of monthly installments for remaining shares issuable Business Acquisition, Equity Interest, Number Of Monthly Installments For Remaining Shares Issuable Business Acquisition, Equity Interest, Number Of Monthly Installments For Remaining Shares Issuable Excess shares purchased and delivered (up to) (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Excess Shares Previously Issued Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Excess Shares Previously Issued Total liabilities Total liabilities Liabilities Trading Symbol Trading Symbol Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Interest Rate Swap, July 15, 2030 Expiration Interest Rate Swap, July 15, 2030 Expiration [Member] Interest Rate Swap, July 15, 2030 Expiration Summary of Outstanding Interest Rate Swaps Schedule of Interest Rate Derivatives [Table Text Block] 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] Income taxes payable Accrued Income Taxes, Current Company Selected Measure Name Company Selected Measure Name Gain (loss) from litigation settlement Gain (Loss) from Litigation Settlement Purchases Payments to Acquire Debt Securities, Available-for-Sale 2019 Plan Two Thousand Nineteen Stock Omnibus Incentive Plan [Member] Two thousand nineteen stock omnibus incentive plan. Interest rate swap, fixed interest rate Derivative, Fixed Interest Rate Changes in client funds obligations Net Increase (Decrease) In Client Funds Obligations, Financing Net Increase (Decrease) In Client Funds Obligations, Financing Diluted Earnings Per Share, Diluted [Abstract] Contingent purchase price liabilities Contingent Purchase Price Liabilities At Fair Value Contingent purchase price liabilities. Credit Facility [Domain] Credit Facility [Domain] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Diluted weighted average shares outstanding (in shares) Diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Deferred income taxes Deferred Income Taxes and Tax Credits Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Outstanding line of credit Short-Term Debt Gain from other acquisition related adjustments Business Combination, Gain (Loss) On Acquisition Related Adjustments, Other Business Combination, Gain (Loss) On Acquisition Related Adjustments, Other Fair value, liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Gross margin Gross Profit Award Timing Predetermined Award Timing Predetermined [Flag] REVISION OF PREVIOUSLY ISSUED INTERIM FINANCIAL STATEMENTS Error Correction [Text Block] Restricted cash Restricted Cash, Current Treasury Stock Treasury Stock, Common [Member] Summary of Other Comprehensive (Loss) Income and Tax Impact Comprehensive Income (Loss) [Table Text Block] Intangible Asset, Goodwill and Other [Abstract] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Letters of credit outstanding Letters of Credit Outstanding, Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Contingent Purchase Price Liabilities Contingent Purchase Price Payable [Member] Contingent purchase price payable. Notional amount, asset Derivative Asset, Notional Amount Cash received from working capital adjustments in business combination Proceeds From Working Capital Adjustments In Business Combination Proceeds From Working Capital Adjustments In Business Combination Adjustment Revision of Prior Period, Error Correction, Adjustment [Member] Outstanding at beginning of period (in dollars per share) Outstanding at 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] Payment of bank debt Repayments of Long-Term Lines of Credit Vesting [Domain] Vesting [Domain] Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Weighted average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Right-of-use assets, net Operating Lease, Right-of-Use Asset Current portion debt issuance costs, Term Loan Debt Issuance Costs, Current, Net Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Summary of Computation of Basic and Diluted Earnings Per Share from Continuing Operations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Benefits and Insurance Services Benefits and Insurance Services Benefits And Insurance Services [Member] Benefits and insurance services. Maturities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale SEGMENT DISCLOSURES Segment Reporting [Text Block] Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Expiration Date Trading Arrangement Expiration Date LIABILITIES Liabilities [Abstract] Diluted earnings per share (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Basic earnings per share (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Share repurchase program, past years approved by board Share Repurchase Program, Past Years Approved By Board Share Repurchase Program, Past Years Approved By Board Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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] Unbilled revenue, at net realizable value Unbilled Receivables, Current Business Combination [Line Items] Business Combination [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Cash settlement paid Payments for Previous Acquisition Assets of deferred compensation plan Assets of deferred compensation plan Deferred Compensation Plan Assets Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report 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] Interest rate swaps Interest Rate Swap [Member] Restricted stock units and awards Restricted Stock or Unit Expense Right of First Refusal Agreement Right Of First Refusal Agreement [Member] Right Of First Refusal Agreement Redemptions Proceeds from Sale of Debt Securities, Available-for-Sale DEBT AND FINANCING ARRANGEMENTS Debt Disclosure [Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Business Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Long-term line of credit Bank debt, net Long-Term Line of Credit, Noncurrent Secured Debt Secured Debt [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Total segment expense Costs and Expenses Total accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Business acquisitions Stock Issued During Period, Value, 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Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Proceeds from notes receivable acquired as part of business combination Proceeds From Notes Receivable Acquired As Part Of Business Combination Proceeds From Notes Receivable Acquired As Part Of Business Combination Insider Trading Policies and Procedures [Line Items] Stock options outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Interest Rate Swap, August 2027 Expiration Interest Rate Swap, August 2027 Expiration [Member] Interest Rate Swap, August 2027 Expiration Allowance for doubtful accounts Balance at beginning of period Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Other, net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Performance share units PSU Performance Shares [Member] Summary of Unsecured Credit Facility Schedule of Line of Credit Facilities [Table Text Block] Share repurchase program, authorized, number of shares (in shares) Share Repurchase Program, Authorized, Number of Shares Income taxes payable Accrued Income Taxes, Noncurrent Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Schedule of Error Corrections and Prior Period Adjustments Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Business Combination [Domain] Business Combination [Domain] Provisional information, initial accounting incomplete, adjustment, receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivable Business Combination, Provisional Information, Initial Accounting Incomplete, 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Combination [Axis] Business Combination [Axis] Equity [Abstract] Equity [Abstract] 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 provided by operating activities Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation STOCKHOLDERS' EQUITY Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Restricted stock units and awards Restricted Stock Units and Awards Restricted Stock Units And Awards [Member] Restricted stock units and awards. Transfer - Accumulated impairment Goodwill, Impaired, Transfers Goodwill, Impaired, Transfers City Area Code City Area Code Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] SUBSEQUENT EVENTS Subsequent Events [Text Block] Name Forgone Recovery, Individual Name Contingent purchase price liabilities Business Combination, Contingent Consideration, Liability, Noncurrent As Previously Reported Previously Reported [Member] Performance share units (in shares) Incremental Common Shares Attributable to Performance Share Incremental common shares attributable to Performance Share Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted Average Grant-Date Fair Value Weighted Average Grant-Date Fair Value Per Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Line Items] Statement [Line Items] Total non-current assets Assets, Noncurrent Total assets Assets Operating Segments Operating Segments [Member] Interest expense Interest expense Interest Expense, Nonoperating Summary of Compensation Expense for Stock-Based Awards Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Proceeds from business combination Proceeds From Adjustments Post Business Combination Proceeds From Adjustments Post Business Combination Interest Rate Swap, April 2030 Expiration Interest Rate Swap, April 2030 Expiration [Member] Interest Rate Swap, April 2030 Expiration EMPLOYEE STOCK PLANS Share-Based Payment Arrangement [Text Block] Schedule Of Common Stock [Line Items] Schedule Of Common Stock [Line Items] Schedule Of Common Stock [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Dilutive securities included and antidilutive securities excluded from computation of earnings per share. 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Available funds under credit facility Line of Credit Facility, Remaining Borrowing Capacity Current portion, Term Loan Line of Credit, Current Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] GOODWILL Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] FINANCIAL INSTRUMENTS Financial Instruments Disclosure [Text Block] Other, net Payment for (Proceeds from) Other Investing Activity Business acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Segment Reporting [Table] Segment Reporting [Table] Maximum stock based compensation awards granted under the plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Funds held for clients Funds Held for Clients Title and Position [Axis] Title and Position [Axis] Contingent purchase price liabilities Business Combination, Contingent Consideration, Liability, Current Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income Operating Income (Loss) Bad debt expense, net of recoveries Provision For Doubtful Accounts Net Of Recoveries Provision for doubtful accounts net of recoveries. Current Fiscal Year End Date Current Fiscal Year End Date Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Net (income) expense Business Combination Contingent Consideration Liability Other Adjustments Based On Projected Future Results Of Acquisition Business combination contingent consideration liability other adjustments based on projected future results of acquisition. Remaining number of shares issuable (in shares) Business Acquisition, Equity Interest, Remaining Number Of Shares Issuable Business Acquisition, Equity Interest, Remaining Number Of Shares Issuable BUSINESS COMBINATIONS Business Combination [Text Block] 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Summary of Recognized Interest Expense Interest Expense Table [Table Text Block] Cash and non-cash interest expense related to the Convertible Notes for the periods presented. Restricted stock units and awards and performance share units Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Payment of contingent consideration for acquisitions and client lists Payment Of Contingent Consideration Of Acquisitions Payment of contingent consideration for acquisitions. Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, beginning balance (in shares) Common stock, ending balance (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, beginning balance (in shares) Treasury stock, ending balance (in shares) Treasury Stock, Common, Shares OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable, net Increase (Decrease) in Accounts Receivable Entity Interactive Data Current Entity Interactive Data Current Gain from acquisition related adjustments, net Gain from acquisition related adjustment Gain (Loss) From Acquisition Related Adjustments Gain (Loss) From Acquisition Related Adjustments Deferred income taxes, net Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Indirect repurchase of shares for minimum tax withholding (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Subsequent Events [Abstract] Settlement of contingent purchase price liabilities Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Changes in Accounting Policies Changes In Accounting Policy [Policy Text Block] Changes In Accounting Policy Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other non-current assets Other Assets, Noncurrent Document Type Document Type Financial Services Financial Services Financial Services [Member] Financial services. Business acquisitions and purchases of client lists, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired 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] Fair Value as of Grant Date Award Grant Date Fair Value SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] MOVEit Customer Data Security Breach Litigation MOVEit Customer Data Security Breach Litigation [Member] MOVEit Customer Data Security Breach Litigation Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Shares issued (number) (in shares) Number Of Common Shares Issued Number of common shares issued. Income before income tax expense Income before income tax expense 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] Charge-offs, net of recoveries Allowance For Doubtful Accounts Receivable Write Offs And Net Of Recoveries Allowance for doubtful accounts receivable write offs and net of recoveries. Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Share vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Gain Reclassified from AOCI into Expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Summary of Changes in Contingent Purchase Price Consideration Business Combination, Contingent Consideration [Table Text Block] Share repurchases (in shares) Treasury Stock, Shares, Acquired PEO Name PEO Name Stock-based compensation APIC, Share-Based Payment Arrangement, ESPP, Increase for Cost Recognition Restricted cash Restricted Cash Other costs, gains, and losses, net Segment Reporting, Other Segment Item, Amount Interest Rate Swap, July 2026 Expiration Interest Rate Swap, July 2026 Expiration [Member] Interest Rate Swap, July 2026 Expiration Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Dilutive securities included and antidilutive securities excluded from computation of earnings per share. Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Total Interest Expense, Debt Liability Class [Axis] Liability Class [Axis] Share repurchases Share repurchases, value Treasury Stock, Value, Acquired, Cost Method Cash, cash equivalents and restricted cash at beginning of year Cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Accounts payable Increase (Decrease) in Accounts Payable 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] Additions from business acquisitions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Employee Employee [Member] Employee Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Personnel costs Labor and Related Expense Award vesting (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting, Shares Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting, Shares Summary of Classification Between Short-Term and Long-Term Debt Schedule of Debt [Table Text Block] Employee Stock Purchase Plan Employee Stock [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings per share - basic (in dollars per share) Earnings Per Share, Basic Payment for acquisition of treasury stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt Total long-term debt Long-Term Debt, Excluding Current Maturities Operating expenses Cost of Revenue Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Net unrealized (loss) gain on available-for-sale securities, net of taxes Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Retained earnings Retained Earnings (Accumulated Deficit) Current liabilities before client fund obligations Current Liabilities Before Client Fund Obligations Current liabilities before client fund obligations. Other Other Interest Expense [Member] Other interest expense. Gain (Loss) Recognized in AOCI, net of tax Net unrealized gain (loss) on interest rate swaps, net of taxes Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Adjustment to contingent purchase price liabilities 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] Number of reporting units Goodwill, Reporting Unit, Number Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Fair value at beginning of period Fair value at end of period Available-for-sale debt securities Debt Securities, Available-for-Sale Interest Rate Swap, October 2028 Expiration Interest Rate Swap, October 2028 Expiration [Member] Interest Rate Swap, October 2028 Expiration Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and stockholders’ equity Liabilities and Equity Goodwill and other intangible assets, net Intangible Asset, Including Goodwill, after Accumulated Amortization Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Summary of Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Interest Rate Swap, April 2028 Expiration Interest Rate Swap, April 2028 Expiration [Member] Interest Rate Swap, April 2028 Expiration Other income, net Other income (expense), net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Purchases of client fund investments Payments to Acquire Investments Reconciliation of cash, cash equivalents and restricted cash to the Condensed Consolidated Balance Sheets: Reconciliation Of Cash Cash Equivalents And Restricted Cash To Consolidated Balance Sheet [Abstract] Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets. 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] Expired or canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Non-current assets: Assets, Noncurrent [Abstract] Corporate general and administrative expenses General & administrative expenses General and Administrative Expense Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Adjustment to Compensation: Adjustment to Compensation [Axis] Change in bond premium Increase Decrease In Bond Premium Increase (Decrease) in bond premium. Share Repurchase Program [Axis] Share Repurchase Program [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Change in funds held for clients Increase (Decrease) In Funds Held For Clients Classified As Investing Activities Increase (Decrease) In Funds Held For Clients Classified As Investing Activities Name Measure Name Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Annual amortization rate first two years Debt Instrument, Annual Principal Amortization Payments Rate, Years One And Two Debt Instrument, Annual Principal Amortization Payments Rate, Years One And Two Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Consideration transferred Business Combination, Consideration Transferred Additional Paid In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Director Director [Member] Goodwill impairment loss Goodwill, Impairment Loss Revision of Prior Period [Axis] Revision of Prior Period [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Performance share units Performance Share Units Performance share units. Proceeds from indemnity escrow associated with business combination Proceeds From Indemnity Escrow Associated With Business Combination Proceeds From Indemnity Escrow Associated With Business Combination Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization expense Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Long-term debt Long-Term Debt, Excluding Current Maturities [Abstract] Covenant interest coverage ratio, minimum Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Restricted stock units and awards and performance share units (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Cash price per share (in dollars per share) Business Combination, Price Per Share Corporate And Eliminations Corporate And Eliminations [Member] Corporate And Eliminations Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Exercised or released (in dollars per share) 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 2024 Credit Facilities 2024 Credit Facilities [Member] 2024 Credit Facilities Income tax expense Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Basis of Consolidation Consolidation, Policy [Policy Text Block] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Covenant leverage ratio, maximum, tranche two Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche Two Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche Two Notional amount, liability Derivative Liability, Notional Amount NEW ACCOUNTING PRONOUNCEMENTS Accounting Standards Update and Change in Accounting Principle [Text Block] Share-Based Payment Arrangement, Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Net income Net income Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Interest Rate Swap, December 2026 Expiration Interest Rate Swap, December 2026 Expiration [Member] Interest Rate Swap, December 2026 Expiration Statement [Table] Statement [Table] Share-Based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Transfer - Gross goodwill Goodwill, Transfers Net income Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Fair value, asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Change in net present value of contingencies Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Change In Net Present Value Of Contingencies Fair value measurement with unobservable inputs reconciliation recurring basis liability change in net present value of contingencies. Number of claims filed Loss Contingency, New Claims Filed, Number Share-based Payment Arrangement Share-Based Payment Arrangement [Member] Covenant leverage ratio, maximum, tranche one Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche One Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche One Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]