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Long-Term Incentive Employee Compensation Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 23, 2017
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares initially available for awards under this Stock Option plan 4,600,000        
Share available for future grant under stock option 38,200,000        
Share-based compensation, vesting period 3 years        
Contractual period 10 years        
Intrinsic value of options exercised $ 10.6 $ 9.6 $ 6.6    
Cash received from the exercise of stock options 11.2 12.3 6.2    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 7.0 10.5 6.3    
Excess Tax benefit from stock activity 2.7        
Excess Tax Benefit from Share-based Compensation, Financing Activities $ 0.0 $ 3.2 $ 3.4    
Options Outstanding Number 900,000 1,400,000 1,700,000   1,900,000
Dividend yield   1.50% 1.10%    
Share Price $ 53.37     $ 41.68  
Equity Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to unvested options and restricted stock $ 17.1        
Unrecognized compensation cost weighted average amortization period (years) 1 year 9 months 18 days        
Liability Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to unvested options and restricted stock $ 2.9        
Unrecognized compensation cost weighted average amortization period (years) 1 year 9 months 18 days        
PSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total number of shares expected to vest 300,000        
TSR Plan Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield 1.23%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend $ 0.512        
Share Price       $ 41.68  
ROIC Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield 1.23%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend $ 0.512        
Out of the Money Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options Outstanding Number 0