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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-Based Compensation [Abstract]        
Stock-based compensation cost $ 3.1 $ 2.1 $ 5.4 $ 3.5
Unrecognized compensation cost and recognition period [Abstract]        
Unrecognized compensation expense 15.8   $ 15.8  
Weighted-average remaining service period     2 years 6 months  
Stock Options [Member]        
Type and fair value of stock-based compensation awards granted [Abstract]        
Options granted (in shares)     0.2 0.3
Weighted-average fair value of options (in dollars per share)     $ 7.30 $ 4.60
Assumptions used in determining fair value of options [Abstract]        
Expected life of awards     6 years 4 months 24 days 6 years 4 months 24 days
Risk-free interest rate     1.90% 1.40%
Expected volatility of the Company's stock     44.30% 45.50%
Expected dividend yield on the Company's stock     0.00% 0.00%
Unrecognized compensation cost and recognition period [Abstract]        
Unrecognized compensation expense 2.9   $ 2.9  
Weighted-average remaining service period     2 years 10 months 24 days  
Restricted Stock Awards [Member]        
Type and fair value of stock-based compensation awards granted [Abstract]        
Stock granted (in shares)     0.2 0.3
Fair value of stock granted (in dollars per share)     $ 15.90 $ 10.00
Unrecognized compensation cost and recognition period [Abstract]        
Unrecognized compensation expense 6.8   $ 6.8  
Weighted-average remaining service period     2 years 9 months 18 days  
Performance Stock Awards [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 0.3
Fair value of stock granted (in dollars per share)     $ 15.90 $ 10.00
Unrecognized compensation cost and recognition period [Abstract]        
Unrecognized compensation expense $ 6.1   $ 6.1  
Weighted-average remaining service period     2 years  
Unrestricted Stock Awards [Member]        
Type and fair value of stock-based compensation awards granted [Abstract]        
Stock granted (in shares)     0.1 0.1
Fair value of stock granted (in dollars per share)     $ 16.95 $ 9.38