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Long-Term Incentive Employee Compensation Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 04, 2020
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share available for future grant under stock option 37,200,000        
Share-based compensation, vesting period 3 years        
Contractual period 10 years        
Intrinsic value of options exercised $ 4.1 $ 11.1 $ 4.5    
Cash received from the exercise of stock options 4.3 14.9 5.8    
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 4.1 6.5 3.0    
Excess Tax benefit from stock activity $ 3.0 $ 4.6 $ 2.2    
Options Outstanding Number 200,000 300,000 700,000   900,000
Share Price $ 77.02     $ 61.17  
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 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 $ 1.3        
Unrecognized compensation cost weighted average amortization period (years) 2 years        
Equity-settled PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total number of shares expected to vest 400,000        
TSR Plan Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield 1.11%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend $ 0.676        
Share Price       61.17  
ROIC Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield 1.11%        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend $ 0.676        
Share Price       $ 61.17  
Out of the Money Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options Outstanding Number 0