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Share-Based Compensation - Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Time-based Restricted Stock Units        
Units (In thousands)        
Beginning balance (in shares)   34,633    
Granted (in shares)   1,033,189    
Vested (in shares)   (19,566)    
Forfeited (in shares)   (20,000)    
Ending balance (in shares)   1,028,256 34,633  
Aggregate intrinsic value   $ 26.3    
Performance-Based Restricted Stock Units        
Units (In thousands)        
Beginning balance (in shares)   71,428    
Granted (in shares)   0    
Vested (in shares)   0    
Forfeited (in shares)   0    
Ending balance (in shares)   71,428 71,428  
Aggregate intrinsic value   $ 1.8    
Market-Based Restricted Stock Units        
Units (In thousands)        
Beginning balance (in shares)   0    
Granted (in shares)   604,000    
Vested (in shares)   0    
Forfeited (in shares)   (16,500)    
Ending balance (in shares)   587,500 0  
Aggregate intrinsic value   $ 15.0    
Granted, grant date fair value (in USD per share) $ 13.43      
Restricted Stock Units        
Units (In thousands)        
Granted, grant date fair value (in USD per share)   $ 17.21 $ 13.13 $ 10.84
Vested, grant date fair value (in USD per share)   11.27    
Forfeited, grant date fair value (in USD per share)   14.83    
Outstanding, grant date fair value (in USD per share)   $ 17.06    
Amount of vested awards (in shares)   613,605    
Aggregate intrinsic value of awards vested   $ 15.7    
Intrinsic value of awards vested (in USD per share)   $ 25.54