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STOCK-BASED COMPENSATION - Total Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense, before income taxes | $ 78.4 | $ 81.6 | $ 71.8
Cost of services |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense, before income taxes | 13.3 | 13.4 | 14.5
Selling, general and administrative expenses |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense, before income taxes | $ 65.1 | $ 68.2 | $ 57.3

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