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Share-Based Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding stock option awards 0.5    
Outstanding stock option awards, exercisable 0.1    
Outstanding weighted average exercise price $ 46.83    
Outstanding exercisable weighted average exercise price $ 18.58    
Outstanding intrinsic value $ 14.0    
Outstanding exercisable intrinsic value $ 7.0    
Outstanding weighted average remaining contractual live 6 years 3 months 18 days    
Outstanding exercisable weighted average remaining contractual live 1 year 7 months 6 days    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, options, awards granted 0.4    
Percentage of premium of the grant date fair market value 25.00%    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 56.19    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, grant date fair value $ 2.3    
Employee Stock Option | Exercise Prices Equal to Fair Market Value      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, options, awards granted 0.1    
Employee Stock Option | Stock options with exercise prices at a 25% premium of the grant date fair market value      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, options, awards granted 0.3    
Employee Stock Option | First three anniversaries of the date of grant (seven-year term option)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, award vesting percentage 0.3333%    
Share-Based Compensation, vesting period 3 years    
Share-Based Compensation, options term 7 years    
Employee Stock Option | Fourth, fifth and sixth anniversaries of the date of grant (ten-year term option)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, award vesting percentage 0.3333%    
Share-Based Compensation, vesting period 3 years    
Share-Based Compensation, options term 10 years    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, other than options, awards granted 0.4 0.2 0.3
Share-Based Compensation, award vesting percentage 0.3333%    
Share-Based Compensation, vesting period 3 years    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, other than options, awards granted 1.9 1.0 0.9
Share-Based Compensation, award vesting percentage 0.3333%    
Share-Based Compensation, vesting period 3 years    
Liabilities related to share based payments $ 70.0    
Payment related to share-based liabilities 69.0 $ 85.0 $ 86.0
Equity awards fair value $ 80.0 $ 92.0 $ 97.0
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation, vesting period 3 years    
Share-Based Compensation, vesting date Dec. 31, 2018    
Number of days used to compute performance period average closing price of restricted stock units 20 days