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Long-term Compensation Plans - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award        
Awards outstanding (in shares) 4,939,688 4,833,766    
Out the Money        
Share-based Compensation Arrangement by Share-based Payment Award        
Outstanding stock options vested (in shares) 0      
In the Money        
Share-based Compensation Arrangement by Share-based Payment Award        
Outstanding stock options vested (in shares) 184,053      
Vested options outstanding, aggregate intrinsic value $ 1.2      
Nonvested options (in shares) 381,567      
Aggregate intrinsic value of nonvested options $ 2.2      
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award        
Awards granted (in shares) 0      
Vested in period, fair value $ 9.7 $ 18.5 $ 9.9  
RSU Outstanding (in shares) 4,197,010 4,189,660    
Vesting period 32 months 44 months 26 months  
RSUs | Key Executives        
Share-based Compensation Arrangement by Share-based Payment Award        
RSU Outstanding (in shares) 2,300,000      
Weighted-average grant date fair value $ 25.1      
Performance-based        
Share-based Compensation Arrangement by Share-based Payment Award        
RSU Outstanding (in shares) 3,745,511      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award        
Vesting period 3 years      
Award expiration period 10 years      
The 2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award        
Total number of shares of common stock that may be subject to grant awards (in shares)       15,500,000
Awards granted (in shares) 4,238,736      
Awards outstanding (in shares) 4,939,688