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Long-Term Incentive Employee Compensation Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 04, 2019
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share available for future grant under stock option 37,500,000        
Share-based compensation, vesting period 3 years        
Contractual period 10 years        
Intrinsic value of options exercised $ 11.1 $ 4.5 $ 10.6    
Cash received from the exercise of stock options 14.9 5.8 11.2    
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 6.5 3.0 7.0    
Excess Tax benefit from stock activity $ 4.6 $ 2.2 $ 2.7    
Options Outstanding Number 300,000 700,000 900,000   1,400,000
Share Price $ 73.91     $ 58.36  
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 $ 16.8        
Unrecognized compensation cost weighted average amortization period (years) 1 year 8 months 12 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 $ 1.6        
Unrecognized compensation cost weighted average amortization period (years) 1 year 4 months 24 days        
PSUs          
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 $ 0.588        
Share Price       $ 58.36  
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 $ 0.588        
Out of the Money Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options Outstanding Number 0