Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Total Stock-Based Compensation Expense (Details)

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STOCK-BASED COMPENSATION - Total Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes $ 71.8 $ 62.6 $ 54.9
Cost of services      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes 14.5 12.4 12.0
Selling, general and administrative expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes $ 57.3 $ 50.2 $ 42.9