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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, 2018
Dec. 31, 2017
Dec. 31, 2016
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) 879,800    
Granted (in shares) 417,600    
Forfeited or expired (in shares) (10,400)    
Outstanding ending balance (in shares) 1,287,000 879,800  
Exercisable (in shares) 0    
Expected to vest in future periods (in shares) 1,271,200    
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 8.04    
Granted (in dollars per share) 16.73 $ 11.97 $ 6.01
Forfeited or expired (in dollars per share) 17.92    
Ending balance (in dollars per share) 10.88 8.04  
Outstanding beginning balance (in dollars per share) 37.95    
Granted (in dollars per share) 73.45    
Forfeited or expired (in dollars per share) 73.45    
Outstanding ending balance (in dollars per share) 49.18 $ 37.95  
Exercisable (in dollars per share) 0.00    
Expected to vest in future periods (in dollars per share) $ 49.10    
Outstanding, Weighted- Average Remaining Contractual Term (in years) 4 years 2 months 12 days    
Expected to vest in future periods, Weighted- Average Remaining Contractual Term (in years) 4 years 2 months 12 days    
Outstanding, Aggregate Intrinsic Value (in millions) $ 23.5    
Exercisable, Aggregate Intrinsic Value (in millions) 0.0    
Expected to vest in future periods, Aggregate Intrinsic Value (in millions) $ 23.3    
Market price (in dollars per share) $ 64.65    
Expected forfeiture rate 0.00%    
Time Based Vesting Option      
Shares (in thousands)      
Outstanding beginning balance (in shares) 40,600    
Exercised (in shares) (37,900)    
Outstanding ending balance (in shares) 2,700 40,600  
Exercisable (in shares) 0 100,000 100,000
Expected to vest in future periods (in shares) 2,400    
Weighted-Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 8.66    
Granted (in dollars per share)   $ 21.09  
Exercised (in dollars per share) 7.77    
Ending balance (in dollars per share) 21.09 8.66  
Outstanding beginning balance (in dollars per share) 26.74    
Exercised (in dollars per share) 22.57    
Outstanding ending balance (in dollars per share) 84.65 26.74  
Exercisable (in dollars per share) 0.00 $ 22.57 $ 28.80
Expected to vest in future periods (in dollars per share) $ 84.65    
Outstanding, Weighted- Average Remaining Contractual Term (in years) 4 years 9 months 18 days    
Expected to vest in future periods, Weighted- Average Remaining Contractual Term (in years) 4 years 9 months 18 days    
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) $ 64.65