Income Taxes Operating loss carryforwards (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 78.0
Operating Loss Carryforwards, Expiration Dates	2014 and 2033
Other Tax Carryforward, Valuation Allowance	22.8
Alternative Minimum Tax [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 160.6
Operating Loss Carryforwards, Expiration Dates	2032 and 2033