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Share-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of RSUs and restricted stock vested in period $ 70.0 $ 76.0 $ 80.0
Stock option awards outstanding (in shares) 400    
Stock option awards exercisable (in shares) 200    
Weighted-average exercise price of stock options outstanding (in dollars per share) $ 55.62    
Weighted-average exercise price of stock options exercisable (in dollars per share) $ 47.07    
Intrinsic value of stock options outstanding $ 12.0    
Intrinsic value of stock options exercisable $ 6.0    
Weighted average remaining contractual lives of stock options outstanding 5 years 9 months 18 days    
Weighted average remaining contractual lives of stock options exercisable 3 years 9 months 18 days    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 1,800    
Liabilities related to share based payments $ 51.0    
Payment related to share-based liabilities $ 28.0 $ 50.0 $ 69.0
Time-Vested RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 1,100    
Vesting period 3 years    
Number of days used to compute performance period average closing price of restricted stock units 20 days    
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 700    
Vesting period 3 years    
Number of days used to compute performance period average closing price of restricted stock units 20 days    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares)   36 100
Weighted-average grant date exercise price of stock options granted (in dollars per share)   $ 77.56  
Weighted-average grant date fair value of stock options granted   $ 0.7  
Stock Options | Exercise Prices at a 25% Premium of the Grant Date Fair Value      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options granted (in shares)     300
Weighted-average grant date exercise price of stock options granted (in dollars per share)     $ 56.19
Weighted-average grant date fair value of stock options granted     $ 2.3
Percentage of premium of the grant date fair market value     25.00%