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, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes $ 38.3 $ 37.1 $ 38.4
Cost of services      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes 7.2 4.5 5.0
Selling, general and administrative expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes $ 31.1 $ 32.6 $ 33.4