Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-Based Compensation [Abstract]
Stock-based compensation cost	$ 1.9	$ 1.7	$ 3.0	$ 2.7
Assumptions used in determining fair value of options [Abstract]
Expected life of awards			6 years 3 months 18 days	6 years 3 months 18 days
Risk-free interest rate			1.90%	2.10%
Expected volatility of the Company's stock			66.90%	76.10%
Expected dividend yield on the Company's stock			0.00%	0.00%
Unrecognized compensation cost and recognition period [Abstract]
Unrecognized Compensation Cost	11.8		$ 11.8
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	0.1
Options, grant date fair value (in dollars per share)			$ 7.11	$ 10.21
Unrecognized compensation cost and recognition period [Abstract]
Unrecognized Compensation Cost	2.5		$ 2.5
Weighted-Average Remaining Service Period			2 years 10 months 24 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	6.2		$ 6.2
Weighted-Average Remaining Service Period			2 years 9 months 18 days
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	$ 3.1		$ 3.1
Weighted-Average Remaining Service Period			2 years 2 months 12 days
Unrestricted Stock [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)			$ 10.45	$ 14.83