Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Stock-Based Compensation [Abstract]
Stock-based compensation cost	$ 0.9	$ 0.9
Performance period	3 years
Unrecognized compensation cost and recognition period [Abstract]
Unrecognized Compensation Costs	10.4
Weighted Average Remaining Service Period in Years	3 years
Assumptions used in determining the fair value for the 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)	1.30%	0.90%
Expected volatility of the Company's stock (in hundredths)	88.70%	87.40%
Expected dividend yield on the Company's stock (in hundredths)	0.00%	0.00%
Stock options [Member]
Unrecognized compensation cost and recognition period [Abstract]
Unrecognized Compensation Costs	2.1
Weighted Average Remaining Service Period in Years	3 years
Type and fair value of stock-based compensation awards granted [Abstract]
Options granted (in shares)	0.2	0.2
Options, grant date fair value (in dollars per share)	$ 7.76	$ 4.23
Restricted stock - retention [Member]
Unrecognized compensation cost and recognition period [Abstract]
Unrecognized Compensation Costs	5.2
Weighted Average Remaining Service Period in Years	3 years 3 months 18 days
Type and fair value of stock-based compensation awards granted [Abstract]
Stock granted (in shares)	0.3	0.4
Fair value of stock granted (in dollars per share)	$ 10.40	$ 5.75
Restricted stock - performance based [Member]
Unrecognized compensation cost and recognition period [Abstract]
Unrecognized Compensation Costs	$ 3.1
Weighted Average Remaining Service Period in Years	2 years 6 months
Type and fair value of stock-based compensation awards granted [Abstract]
Stock granted (in shares)	0.2	0.4
Fair value of stock granted (in dollars per share)	$ 10.40	$ 5.75