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Share-based Compensation - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Performance Share Units [Line Items]        
Description of share based compensation plan The Company maintains a share-based compensation plan which authorizes the granting of various equity-based incentives including stock options and restricted stock units ("RSUs") to employees and nonemployee directors.      
Share-based compensation plan, number of shares of common stock reserved for issuance 51.5      
Stock options, number of years to expire 10 years      
Outstanding stock options 18.9 21.5 21.9 23.4
Proceeds from stock option exercises $ 456.8 $ 299.4 $ 317.2  
Tax benefit on stock option exercises and other 0.0 0.6 44.8  
RSUs vested, total fair value $ 87.6 99.3 49.4  
Stock Compensation Plan        
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Performance Share Units [Line Items]        
Outstanding stock options 31.0      
Stock Option        
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Performance Share Units [Line Items]        
Stock options exercised total intrinsic value $ 353.6 $ 184.9 $ 202.9  
Tax benefit on stock option exercises and other 111.0      
Restricted Stock Units (RSUs)        
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Performance Share Units [Line Items]        
Tax benefit on stock option exercises and other $ 23.9      
Vesting percentage 100.00%      
Vesting period 3 years