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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Stock-Based Compensation [Abstract]    
Stock-based compensation cost $ 1.1 $ 1.0
Assumptions used in determining fair value of options [Abstract]    
Expected life of awards in years 6 years 3 months 18 days 6 years 3 months 18 days
Risk-free interest rate (in hundredths) 1.90% 2.10%
Expected volatility of the Company's stock (in hundredths) 66.90% 76.10%
Expected dividend yield on the Company's stock (in hundredths) 0.00% 0.00%
Unrecognized compensation cost and recognition period [Abstract]    
Unrecognized Compensation Cost $ 13.5  
Weighted-Average Remaining Service Period in Years 2 years 10 months 24 days  
Stock Options [Member]    
Type and fair value of stock-based compensation awards granted [Abstract]    
Options granted (in shares) 0.2 0.1
Options, grant date fair value (in dollars per share) $ 7.11 $ 10.21
Unrecognized compensation cost and recognition period [Abstract]    
Unrecognized Compensation Cost $ 2.8  
Weighted-Average Remaining Service Period in Years 3 years 2 months 12 days  
Restricted Stock - Retention [Member]    
Type and fair value of stock-based compensation awards granted [Abstract]    
Stock granted (in shares) 0.3 0.2
Fair value of stock granted (in dollars per share) $ 11.39 $ 14.94
Unrecognized compensation cost and recognition period [Abstract]    
Unrecognized Compensation Cost $ 6.9  
Weighted-Average Remaining Service Period in Years 3 years  
Restricted Stock - Performance Based [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award performance period 3 years  
Type and fair value of stock-based compensation awards granted [Abstract]    
Stock granted (in shares) 0.2 0.2
Fair value of stock granted (in dollars per share) $ 11.39 $ 14.94
Unrecognized compensation cost and recognition period [Abstract]    
Unrecognized Compensation Cost $ 3.8  
Weighted-Average Remaining Service Period in Years 2 years 4 months 24 days