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Long-Term Incentive Employee Compensation Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 26, 2018
Dec. 31, 2015
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 38,000,000.0        
Share-based compensation, vesting period 3 years        
Contractual period 10 years        
Intrinsic value of options exercised $ 4.5 $ 10.6 $ 9.6    
Cash received from the exercise of stock options 5.8 11.2 12.3    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 3.0 7.0 10.5    
Excess Tax benefit from stock activity $ 2.2 $ 2.7      
Excess Tax Benefit from Share-based Compensation, Financing Activities     $ 3.2    
Options Outstanding Number 700,000 900,000 1,400,000   1,700,000
Dividend yield     1.50%    
Share Price $ 48.27     $ 53.27  
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 $ 14.7        
Unrecognized compensation cost weighted average amortization period (years) 1 year 10 months 24 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 $ 2.3        
Unrecognized compensation cost weighted average amortization period (years) 1 year 9 months 18 days        
PSU awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total number of shares expected to vest 600,000        
TSR Plan Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield 1.01%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend $ 0.536        
Share Price       $ 53.27  
ROIC Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield 1.01%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend $ 0.536        
Out of the Money Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options Outstanding Number 0