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Cost Reduction Actions - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
employee
Sep. 30, 2016
USD ($)
employee
Sep. 30, 2017
USD ($)
employee
Sep. 30, 2016
USD ($)
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Restructuring Cost and Reserve [Line Items]            
Restructuring charges $ 46.1 $ 31.9 $ 99.0 $ 69.0 $ 82.1 $ 118.5
Severance costs 49.5 26.5 86.2 54.9    
Other expenses related to the cost reduction effort (3.4) 5.4 12.8 14.1    
Cost of Revenue | Services            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 42.8 18.0 70.4 34.6    
Cost of Revenue | Technology            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges     0.4      
Selling, general and administrative expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 7.9 14.2 27.4 33.0    
Research and development expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 1.1 0.3 1.4 1.4    
Other income (expense), net            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges (5.7)   (0.6)      
Idle leased facilities            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges     3.5      
Other expenses related to the cost reduction effort 0.6   3.5      
Contract amendment and termination            
Restructuring Cost and Reserve [Line Items]            
Other expenses related to the cost reduction effort 0.1   5.3      
Professional fees and other            
Restructuring Cost and Reserve [Line Items]            
Other expenses related to the cost reduction effort 0.9   3.9      
Net asset sales and write-offs            
Restructuring Cost and Reserve [Line Items]            
Other expenses related to the cost reduction effort 0.7   0.7      
Net foreign currency translation adjustment            
Restructuring Cost and Reserve [Line Items]            
Other expenses related to the cost reduction effort (5.7)   (0.6)      
Net foreign currency translation adjustment | Other income (expense), net            
Restructuring Cost and Reserve [Line Items]            
Restructuring charges 5.7   0.6      
United States            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ 2.6 $ 0.5 $ 7.9 $ 5.8    
Number of employees | employee 93 49 507 293    
United States | Changes in estimates            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ (0.4)   $ (0.6)      
Non-US            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ 48.3 $ 26.0 $ 72.3 $ 49.1    
Number of employees | employee 1,459 329 1,835 928    
Non-US | Changes in estimates            
Restructuring Cost and Reserve [Line Items]            
Severance costs $ (1.0)   $ (1.6)      
Non-US | Additional benefits provided in 2017            
Restructuring Cost and Reserve [Line Items]            
Severance costs     $ 8.2      
Minimum            
Restructuring Cost and Reserve [Line Items]            
Estimated pretax restructuring charges           320.0
Maximum            
Restructuring Cost and Reserve [Line Items]            
Estimated pretax restructuring charges           $ 330.0