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Share-Based Compensation (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 03, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares received per restricted stock unit (in shares)       1    
Total compensation cost related to nonvested awards, unrecognized   $ 42.5   $ 42.5   $ 34.6
Weighted-average period to recognize compensation cost (in years)       3 years    
Aggregate intrinsic value for outstanding SARs and RSUs   $ 95.8   $ 95.8    
Aggregate intrinsic value for vested SARs and RSUs       $ 50.0    
Weighted-average remaining contractual life for outstanding SARs and RSUs (in years)       6 years    
Weighted-average remaining contractual life for exercisable SARs and RSUs, (in years)       5 years    
Share-based compensation       $ 8.1 $ 10.0  
Outstanding options to purchase common shares not included in dilutive shares (in shares)   2,000,000 1,500,000 1,700,000 1,100,000  
Stock Appreciation Rights [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 744,000          
Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 166,000          
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based payment award granted vesting period range (in years)       1 year    
Share-based payment, awards exercise period (in years and months)       12 months    
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based payment award granted vesting period range (in years)       5 years    
Share-based payment, awards exercise period (in years and months)       10 years