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Share-Based Compensation Plans - Options Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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) 1,191,100    
Granted (in shares) 0    
Forfeited or expired (in shares) 0    
Exercised (in shares) (26,100)    
Outstanding ending balance (in shares) 1,165,000.0 1,191,100  
Exercisable (in shares) 757,800 485,000.0  
Expected to vest in future periods (in shares) 407,200    
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 11.52    
Granted (in dollars per share) 0   $ 16.73
Forfeited or expired (in dollars per share) 0    
Exercised (in dollars per share) 27.14    
Ending balance (in dollars per share) 11.17 $ 11.52  
Outstanding beginning balance (in dollars per share) 50.51    
Granted (in dollars per share) 0    
Forfeited or expired (in dollars per share) 0    
Exercised (in dollars per share) 52.75    
Outstanding ending balance (in dollars per share) 50.46 50.51  
Exercisable (in dollars per share) 38.11 $ 29.87  
Expected to vest in future periods (in dollars per share) $ 73.45    
Outstanding, Weighted-Average Remaining Contractual Term (in years) 2 years 2 months 12 days    
Exercisable, Weighted-Average Remaining Contractual Term (in years) 1 year 8 months 12 days    
Expected to vest in future periods, Weighted- Average Remaining Contractual Term (in years) 3 years    
Outstanding, Aggregate Intrinsic Value (in millions) $ 25.7    
Exercisable, Aggregate Intrinsic Value (in millions) 25.7    
Expected to vest in future periods, Aggregate Intrinsic Value (in millions) $ 0.0    
Market price (in dollars per share) $ 72.00    
Expected forfeiture rate 0.00%    
Time Based Vesting Option      
Shares (in thousands)      
Outstanding beginning balance (in shares) 127,000.0    
Granted (in shares) 80,800    
Forfeited or expired (in shares) 0    
Outstanding ending balance (in shares) 207,800 127,000.0  
Exercisable (in shares) 2,700    
Expected to vest in future periods (in shares) 205,100    
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 21.56    
Granted (in dollars per share) 21.10 $ 21.58  
Forfeited or expired (in dollars per share) 0    
Ending balance (in dollars per share) 21.38 21.56  
Outstanding beginning balance (in dollars per share) 79.32    
Granted (in dollars per share) 84.42    
Forfeited or expired (in dollars per share) 0    
Outstanding ending balance (in dollars per share) 81.30 $ 79.32  
Exercisable (in dollars per share) 84.65    
Expected to vest in future periods (in dollars per share) $ 81.26    
Outstanding, Weighted-Average Remaining Contractual Term (in years) 4 years 6 months    
Exercisable, Weighted-Average Remaining Contractual Term (in years) 2 years 9 months 18 days    
Expected to vest in future periods, Weighted- Average Remaining Contractual Term (in years) 4 years 6 months    
Outstanding, Aggregate Intrinsic Value (in millions) $ 0.0    
Exercisable, Aggregate Intrinsic Value (in millions) 0.0    
Expected to vest in future periods, Aggregate Intrinsic Value (in millions) $ 0.0    
Market price (in dollars per share) $ 72.00