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Stock-Based Compensation, Restricted Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Compensation expense [Abstract]      
Stock-based compensation cost $ 7.9 $ 9.5 $ 7.4
Restricted Stock [Member]      
Compensation expense [Abstract]      
Stock-based compensation cost 4.3 3.9 3.8
Fair value of awards vesting 4.3 $ 3.9 4.0
Unrecognized compensation costs $ 5.3    
Weighted average period recognized 2 years 6 months    
Assumptions for stock awards granted [Abstract]      
Award vesting period 4 years    
Restricted stock activity [Roll Forward]      
Non-vested balance, beginning (in shares) 0.6    
Granted (in shares) 0.3    
Vested (in shares) (0.3)    
Forfeited (in shares) (0.1)    
Non-vested balance, ending (in shares) 0.5 0.6  
Weighted average price [Rollforward]      
Non-vested balance, beginning (in dollars per share) $ 12.24    
Granted (in dollars per share) 17.72    
Vested (in dollars per share) 13.75    
Forfeited (in dollars per share) 15.03    
Non-vested balance, ending (in dollars per share) $ 14.95 $ 12.24  
Restricted Stock [Member] | Tranche One [Member]      
Assumptions for stock awards granted [Abstract]      
Annual vesting percentage 25.00%    
Restricted Stock [Member] | Tranche Two [Member]      
Assumptions for stock awards granted [Abstract]      
Annual vesting percentage 25.00%    
Restricted Stock [Member] | Tranche Three [Member]      
Assumptions for stock awards granted [Abstract]      
Annual vesting percentage 25.00%    
Restricted Stock [Member] | Tranche Four [Member]      
Assumptions for stock awards granted [Abstract]      
Annual vesting percentage 25.00%    
Performance Stock Awards [Member]      
Compensation expense [Abstract]      
Stock-based compensation cost $ 2.4 $ 4.4 $ 2.5
Unrecognized compensation costs $ 2.4    
Weighted average period recognized 1 year 6 months    
Assumptions for stock awards granted [Abstract]      
Award vesting period 3 years 3 years 3 years