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Segment Information - Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue from External Customer [Line Items]        
Revenues $ 666.3 $ 683.3 $ 1,997.0 $ 2,099.0
Services        
Revenue from External Customer [Line Items]        
Revenues 575.5 600.9 1,735.6 1,809.8
Technology        
Revenue from External Customer [Line Items]        
Revenues 90.8 82.4 261.4 289.2
Cloud & infrastructure services | Services        
Revenue from External Customer [Line Items]        
Revenues 321.2 341.9 983.4 1,017.8
Application services | Services        
Revenue from External Customer [Line Items]        
Revenues 206.4 210.4 604.3 641.4
Business process outsourcing services | Services        
Revenue from External Customer [Line Items]        
Revenues $ 47.9 $ 48.6 $ 147.9 $ 150.6