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Less: Cost of Revenue [Abstract] Earnings (Loss) Per Share Earnings Per Share, Policy [Policy Text Block] Company Selected Measure Name Company Selected Measure Name Senior Notes Senior Notes [Member] Debt Debt Disclosure [Text Block] Preferred stock; $0.01 par value; 5,000,000 shares authorized; no shares issued at March 31, 2026, and December 31, 2025 Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Common stock; $0.005 par value; 280,000,000 shares authorized; 140,525,055 shares issued at March 31, 2026, and December 31, 2025 Common Stock, Value, Issued Diluted (in shares) Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Segment Reporting Segment Reporting, Policy [Policy Text Block] Commitments and contingencies Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Parent Company and Domestic Subsidiaries Parent Company And Domestic Subsidiaries [Member] Parent company and domestic subsidiaries. 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Line of credit, carrying amount Long-Term Line of Credit Amount of off balance sheet settlement funds Settlement Funds Balance The balance of the settlement funds at period end. Settlement funds are trust accounts maintained for the benefit of the Company's clients. They are not included in the Company's balance sheet. 5.750% Senior Notes Due 2026 5.750% Senior Notes Due 2026 [Member] 5.750% Senior Notes Due 2026 Diluted (in dollars per share) Earnings Per Share, Diluted Issuing and acquiring Issuing And Acquiring [Member] Issuing And Acquiring Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Long-lived assets Geographic Areas, Long-Lived Assets [Abstract] Receivables, net of allowances of $1,352 and $1,269, respectively Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Repurchase program, amount paid for shares repurchased to date Treasury Stock, Value, Acquired, Cost Method, To Date Treasury Stock, Value, Acquired, Cost Method, To Date Treasury stock, shares (in shares) Treasury Stock, Common, Shares Income per common share Earnings Per Share [Abstract] Earnings Per Share [Abstract] Consolidation Items [Domain] Consolidation Items [Domain] Total other income (expense) Nonoperating Income (Expense) Deferred revenue Increase (Decrease) in Contract with Customer, Liability Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Foreign currency translation Contract With Customer, Liability, Foreign Currency Translation Amount of increase (decrease) in Contract With Customer Liability Foreign Currency Translation. Income taxes paid Income Taxes Paid, Net Repurchase of common stock (in shares) Shares repurchased (in shares) Treasury Stock, Shares, Acquired Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] Long-term debt, amount outstanding Total Long-Term Debt, Gross Employee compensation Employee-related Liabilities, Current Common Stock and Treasury Stock Equity [Text Block] Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Net income Net income Net Income (Loss) Attributable to Parent Amortization Amortization, Excluding Operating Leases And Debt Issuance Costs Amortization, Excluding Operating Leases And Debt Issuance Costs Expiration Date Trading Arrangement Expiration Date Schedule of Fair Value of TSRs Schedule Of Share Based Payment Award Other Than Stock Options, Valuation Assumptions [Table Text Block] Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards other than stock options, including, but not limited to: (a) expected term of share awards and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. Noncurrent liabilities Liabilities, Noncurrent [Abstract] Vesting performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Property and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Lender Addition And Acknowledgement Agreement Lender Addition And Acknowledgement Agreement [Member] Lender Addition And Acknowledgement Agreement Receivables Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Operating income Operating Income (Loss) Line of Credit Line of Credit [Member] Retained earnings Retained Earnings (Accumulated Deficit) Aggregate Intrinsic Value of In-the-Money Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Components of Other Current Liabilities Schedule of Other Assets and Other Liabilities [Table Text Block] Expected life (years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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] Schedule of Total Receivables, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Other, net Other income (expense) Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash flows from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Accrued receivables, net Long-term accrued receivables, net Accounts Receivable, after Allowance for Credit Loss, Noncurrent Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Current accrued receivables, net Receivables, Net, Current Variable Rate [Domain] Variable Rate [Domain] Deferred revenue, beginning balance Deferred revenue, ending balance Contract with Customer, Liability Condensed Consolidated Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Unrecognized tax benefit for uncertain tax positions Unrecognized Tax Benefits Antidilutive securities excluded from earnings (loss) per share, options to purchase shares and RSUs (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average common shares outstanding Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Stock-based compensation expense, tax benefits Share-Based Payment Arrangement, Expense, Tax Benefit Other Current Liabilities Other Liabilities, Current [Abstract] 2028 Long-Term Debt, Maturity, Year Two Deferral of revenue Contract with Customer, Liability, Additions Amount of revenue deferred in the current period for which consideration has been received or is receivable and an obligation exists to transfer goods or services to the customer. Treasury stock, at cost, 39,160,288 and 37,812,984 shares at March 31, 2026, and December 31, 2025, respectively Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Net cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Weighted Average Remaining Contractual Term (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Basic (in shares) Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Maximum remaining amount authorized for purchase Share Repurchase Program, Remaining Authorized, Amount Schedule of Reconciliation of Weighted Average Share Amounts Used to Compute Basic and Diluted Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Exercisable, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Segment Reporting [Abstract] Segment Reporting [Abstract] Cost of revenue Cost of Revenue Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Amortization of deferred debt issuance costs Amortization of Debt Issuance Costs Other income (expense) Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Proceeds from sale of equity investment Proceeds from Sale of Equity Method Investments Bill payments Biller Payments [Member] Bill Payments [Member] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued 2030 Long-Term Debt, Maturity, Year Four Options granted in period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Amount outstanding on overdraft facility Line of Credit Facility, Fair Value of Amount Outstanding Use of Estimates Use of Estimates, Policy [Policy Text Block] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Credit Agreement Credit Agreement [Member] Credit agreement. Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Off Balance Sheet Settlement Accounts Off Balance Sheet Settlement Accounts, Policy [Policy Text Block] Disclosure of accounting policy for bank accounts for the benefit of clients that are separate from company assets. Remainder of 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Total liabilities Liabilities Settlement liabilities Settlement Liabilities, Current Software, net Capitalized Computer Software, Net Credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Repurchase program, shares repurchased to date (in shares) Treasury Stock, Shares, Acquired, To Date Treasury Stock, Shares, Acquired, To Date Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Operating expenses Operating Expenses [Abstract] Prepaid expenses Prepaid Expense, Current Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Total other current liabilities Other Liabilities, Current Trademarks and trade names Trademarks and Trade Names [Member] Refinance Amendment Refinance Amendment [Member] Refinance Amendment Other Other Sundry Liabilities, Current Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Common Stock Common Stock [Member] Number of shares vested (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Add: Dilutive effect of stock options, RSUs, and contingently issuable shares (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment