Income Taxes Operating loss carryforwards (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 33.6
Operating Loss Carryforwards, Expiration Dates	2014 and 2029
Other Tax Carryforward, Valuation Allowance	5.4
Alternative Minimum Tax [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 52.7
Operating Loss Carryforwards, Expiration Dates	2032