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Cost Reduction Actions - Individual Components of Work Force Reduction and Idle Lease Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Restructuring Reserve [Roll Forward]              
Additional provisions $ 27.5 $ 10.2   $ 52.9 $ 37.1 $ 82.1 $ 118.5
Total              
Restructuring Reserve [Roll Forward]              
Balance at beginning of period     $ 67.2 36.6      
Additional provisions       40.4      
Payments       (12.9)      
Changes in estimates       (0.8)      
Translation adjustments       3.9      
Balance at end of period 67.2     67.2   36.6  
Total | Forecast              
Restructuring Reserve [Roll Forward]              
Payments     (29.3)        
Expected future utilization on balance at June 30, 2017     37.9        
Work-Force Reductions | United States              
Restructuring Reserve [Roll Forward]              
Balance at beginning of period     5.2 1.8      
Additional provisions       5.3      
Payments       (1.7)      
Changes in estimates       (0.2)      
Translation adjustments       0.0      
Balance at end of period 5.2     5.2   1.8  
Work-Force Reductions | United States | Forecast              
Restructuring Reserve [Roll Forward]              
Payments     (5.2)        
Expected future utilization on balance at June 30, 2017     0.0        
Work-Force Reductions | International              
Restructuring Reserve [Roll Forward]              
Balance at beginning of period     58.2 33.4      
Additional provisions       32.2      
Payments       (10.5)      
Changes in estimates       (0.6)      
Translation adjustments       3.7      
Balance at end of period 58.2     58.2   33.4  
Work-Force Reductions | International | Forecast              
Restructuring Reserve [Roll Forward]              
Payments     (23.3)        
Expected future utilization on balance at June 30, 2017     34.9        
Idle Leased Facilities Costs              
Restructuring Reserve [Roll Forward]              
Balance at beginning of period     3.8 1.4      
Additional provisions       2.9      
Payments       (0.7)      
Changes in estimates       0.0      
Translation adjustments       0.2      
Balance at end of period $ 3.8     $ 3.8   $ 1.4  
Idle Leased Facilities Costs | Forecast              
Restructuring Reserve [Roll Forward]              
Payments     (0.8)        
Expected future utilization on balance at June 30, 2017     $ 3.0