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Stock-Based Compensation - 2017 Market-Based RSAs and RSUs (Details) - 2017 Market-Based RSAs and RSUs - USD ($)
$ in Millions
2 Months Ended 3 Months Ended
Jan. 17, 2017
Sep. 30, 2018
Mar. 31, 2018
Market-Based RSAs and RSUs      
Stock-based compensation      
Reversal of previously recognized compensation expense   $ 0.9  
Market-Based RSAs      
Stock-based compensation      
Forfeited (in shares)   120,060  
Market-Based RSAs | TSR and Performance Measures | Senior Management      
Stock-based compensation      
Granted (in shares) 353,508    
Forfeited (in shares)     233,448
Reversal of previously recognized compensation expense     $ 0.8
Market-Based RSUs      
Stock-based compensation      
Forfeited (in shares)   53,360  
Market-Based RSUs | TSR and Performance Measures | Senior Management      
Stock-based compensation      
Granted (in shares) 53,360