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Share-Based Compensation Plans Share-Based Compensation Plans - Options Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance-based Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Contractual term 6 years    
Shares (in thousands)      
Outstanding beginning balance (in shares) 1,287,000.0    
Granted (in shares) 0    
Forfeited or expired (in shares) 0    
Exercised (in shares) (95,900)    
Outstanding ending balance (in shares) 1,191,100 1,287,000.0  
Exercisable (in shares) 485,000.0    
Expected to vest in future periods (in shares) 690,900    
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 10.88    
Granted (in dollars per share) 0 $ 16.73 $ 11.97
Forfeited or expired (in dollars per share) 0    
Exercised (in dollars per share) 44.74    
Ending balance (in dollars per share) 11.52 10.88  
Outstanding beginning balance (in dollars per share) 49.18    
Granted (in dollars per share) 0    
Forfeited or expired (in dollars per share) 0    
Exercised (in dollars per share) 32.69    
Outstanding ending balance (in dollars per share) 50.51 $ 49.18  
Exercisable (in dollars per share) 29.87    
Expected to vest in future periods (in dollars per share) $ 64.90    
Outstanding, Weighted-Average Remaining Contractual Term (in years) 3 years 1 month 6 days    
Exercisable, Weighted-Average Remaining Contractual Term (in years) 2 years 6 months    
Expected to vest in future periods, Weighted- Average Remaining Contractual Term (in years) 3 years 7 months 6 days    
Outstanding, Aggregate Intrinsic Value (in millions) $ 47.8    
Exercisable, Aggregate Intrinsic Value (in millions) 29.5    
Expected to vest in future periods, Aggregate Intrinsic Value (in millions) $ 17.8    
Market price (in dollars per share) $ 90.68    
Expected forfeiture rate 0.00%    
Time Based Vesting Option      
Shares (in thousands)      
Outstanding beginning balance (in shares) 2,700    
Granted (in shares) 138,700    
Forfeited or expired (in shares) (14,400)    
Outstanding ending balance (in shares) 127,000.0 2,700  
Exercisable (in shares) 0   100,000
Expected to vest in future periods (in shares) 125,500    
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 21.09    
Granted (in dollars per share) 21.58   $ 21.09
Forfeited or expired (in dollars per share) 21.60    
Ending balance (in dollars per share) 21.56 $ 21.09  
Outstanding beginning balance (in dollars per share) 84.65    
Granted (in dollars per share) 79.21    
Forfeited or expired (in dollars per share) 79.26    
Outstanding ending balance (in dollars per share) 79.32 $ 84.65  
Exercisable (in dollars per share) 0   $ 22.57
Expected to vest in future periods (in dollars per share) $ 79.32    
Outstanding, Weighted-Average Remaining Contractual Term (in years) 5 years 1 month 6 days    
Expected to vest in future periods, Weighted- Average Remaining Contractual Term (in years) 5 years 1 month 6 days    
Outstanding, Aggregate Intrinsic Value (in millions) $ 1.4    
Exercisable, Aggregate Intrinsic Value (in millions) 0.0    
Expected to vest in future periods, Aggregate Intrinsic Value (in millions) $ 1.4    
Market price (in dollars per share) $ 90.68