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Cost Reduction Actions - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Employee
Sep. 30, 2015
USD ($)
Employee
Sep. 30, 2016
USD ($)
Employee
Sep. 30, 2015
USD ($)
Employee
Dec. 31, 2015
USD ($)
Employee
Apr. 30, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]            
Estimated pretax restructuring charges           $ 300.0
Restructuring charges $ 31.9 $ 17.4 $ 69.0 $ 70.0 $ 118.5  
Severance costs 26.5 9.8 54.9 52.3 78.8  
Asset impairments and other expenses related to the cost reduction effort       17.7 39.7  
Asset impairment charges         20.2  
Other expenses related to the cost reduction effort 5.4 7.6 14.1   19.5  
Cost of Revenue | Services            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 18.0 7.9 34.6 21.2 52.3  
Cost of Revenue | Technology            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges   0.1   0.2 0.3  
Selling, general and administrative expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 14.2 8.6 33.0 36.1 53.5  
Research and development expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 0.3 0.8 1.4 12.5 12.4  
United States            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ 0.5 $ 2.7 $ 5.8 $ 28.1 $ 27.9  
Number of employees | Employee 49 176 293 706 700  
Non-US            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ 26.0 $ 7.1 $ 49.1 $ 24.2 $ 50.9  
Number of employees | Employee 329 114 928 527 782