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Share-Based Compensation (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
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   $ 39.6   $ 39.6   $ 33.0
Weighted-average period to recognize compensation cost (in years)       3 years    
Aggregate intrinsic value for outstanding SARs and RSUs   $ 133.7   $ 133.7    
Aggregate intrinsic value for vested SARs and RSUs       $ 73.6    
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       $ 15.4 $ 13.6  
Outstanding options to purchase common shares not included in dilutive shares (in shares)   700,000 1,300,000 1,200,000 1,200,000  
Stock Appreciation Rights [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 724,000          
Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 170,000          
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