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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of RSUs and restricted stock vested in period $ 99.0 $ 70.0 $ 76.0
Stock option awards outstanding (in shares) 700    
Stock option awards exercisable (in shares) 200    
Weighted-average exercise price of stock options outstanding (in dollars per share) $ 82.12    
Weighted-average exercise price of stock options exercisable (in dollars per share) $ 56.89    
Intrinsic value of stock options outstanding $ 11.0    
Intrinsic value of stock options exercisable $ 6.0    
Weighted average remaining contractual lives of stock options outstanding 7 years 3 months 18 days    
Weighted average remaining contractual lives of stock options exercisable 3 years 8 months 12 days    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 1,200    
Number of days used to compute performance period average closing price of restricted stock units 20 days    
Liabilities related to share based payments $ 44.0    
Payment related to share-based liabilities $ 41.0 $ 28.0 $ 50.0
Time-Vested RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 900    
Vesting period 3 years    
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 300    
Vesting period 3 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 6 years    
Award term 10 years    
Stock options granted (in shares) 307   36
Percentage of premium of the grant date fair market value 25.00%    
Weighted-average grant date exercise price of stock options granted (in dollars per share) $ 110.21   $ 77.56
Weighted-average grant date fair value of stock options granted     $ 0.7