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Share-Based Compensation (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 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 $ 38.0   $ 38.0   $ 34.6
Weighted-average period to recognize compensation cost (in years)     3 years    
Aggregate intrinsic value for outstanding SARs and RSUs $ 105.7   $ 105.7    
Aggregate intrinsic value for vested SARs and RSUs     $ 55.5    
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     $ 12.9 $ 15.4  
Outstanding options to purchase common shares not included in dilutive shares (in shares) 2,500,000 700,000 1,900,000 1,200,000  
Stock Appreciation Rights [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted (in shares)     746,000    
Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted (in shares)     171,000    
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