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Cost Reduction Actions - Additional Information (Detail)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Employee
Jun. 30, 2015
USD ($)
Employee
Jun. 30, 2016
USD ($)
Employee
Jun. 30, 2015
USD ($)
Employee
Dec. 31, 2015
USD ($)
Employee
Apr. 30, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]            
Estimated pretax restructuring charges           $ 300.0
Restructuring charges $ 10.2 $ 52.6 $ 37.1 $ 52.6 $ 118.5  
Severance costs 6.5 42.5 28.6 42.5 78.8  
Asset impairments and other expenses related to the cost reduction effort   10.1   10.1 39.7  
Asset impairment charges   3.5   3.5 20.2  
Other expenses related to the cost reduction effort 3.7 6.6 8.5 6.6 19.5  
Cost of Revenue | Services            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 5.1 13.3 16.6 13.3 52.3  
Cost of Revenue | Technology            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges   0.1   0.1 0.3  
Selling, general and administrative expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 5.5 27.5 18.8 27.5 53.5  
Research and development expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 0.4 11.7 1.7 11.7 12.4  
United States            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ 1.2 $ 25.4 $ 5.4 $ 25.4 $ 27.9  
Number of employees | Employee 69 530 244 530 700  
Non-US            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ 5.3 $ 17.1 $ 23.2 $ 17.1 $ 50.9  
Number of employees | Employee 262 413 599 413 782