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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Stock-Based Compensation [Abstract]    
Stock-based compensation cost $ 2.3 $ 1.4
Unrecognized compensation cost and recognition period [Abstract]    
Unrecognized compensation expense $ 18.6  
Weighted-average remaining service period 2 years 8 months 12 days  
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 3 months 18 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 $ 3.4  
Weighted-average remaining service period 3 years 1 month 6 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 $ 7.9  
Weighted-average remaining service period 3 years  
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 $ 7.3  
Weighted-average remaining service period 2 years 3 months 18 days