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Cost-Reduction Actions - Liabilities and Expected Future Payments Related to Work-Force Reduction Actions (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Restructuring Reserve [Roll Forward]      
Additional provisions $ 27.5 $ 2.6  
Work-force Reductions      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 49.8    
Additional provisions 9.7    
Payments (8.6)    
Changes in estimates (1.2)    
Translation adjustments (1.2)    
Balance at end of period 48.5    
2020 remaining nine months 41.4    
Beyond 2020 41.4    
Work-force Reductions | Forecast      
Restructuring Reserve [Roll Forward]      
2020 remaining nine months     $ 7.1
Beyond 2020     7.1
Work-force Reductions | U.S.      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 5.2    
Additional provisions 2.3    
Payments (0.5)    
Changes in estimates 0.0    
Translation adjustments 0.0    
Balance at end of period 7.0    
2020 remaining nine months 6.8    
Beyond 2020 6.8    
Work-force Reductions | U.S. | Forecast      
Restructuring Reserve [Roll Forward]      
2020 remaining nine months     0.2
Beyond 2020     0.2
Work-force Reductions | International      
Restructuring Reserve [Roll Forward]      
Balance at beginning of period 44.6    
Additional provisions 7.4    
Payments (8.1)    
Changes in estimates (1.2)    
Translation adjustments (1.2)    
Balance at end of period 41.5    
2020 remaining nine months 34.6    
Beyond 2020 $ 34.6    
Work-force Reductions | International | Forecast      
Restructuring Reserve [Roll Forward]      
2020 remaining nine months     6.9
Beyond 2020     $ 6.9