Annual report pursuant to Section 13 and 15(d)

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

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STOCK-BASED COMPENSATION (Total Stock-Based Compensation Expense) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes $ 38.4 $ 38.1 $ 32.2
Cost of services      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes 5.0 4.6 4.2
Selling, general and administrative expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense, before income taxes $ 33.4 $ 33.5 $ 28.0