Insurance Subsidiaries Purchase of Series A Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			12 Months Ended	27 Months Ended
	Mar. 31, 2012 Insurance subsidiaries	Mar. 31, 2013 Series A preferred stock	Mar. 31, 2012 Series A preferred stock	Mar. 31, 2011 Series A preferred stock Insurance subsidiaries	Mar. 31, 2011 Series A preferred stock Insurance subsidiaries
Insurance investments:
Payments for repurchase of preferred stock and preference stock					$ 7.2
Preferred stock, shares issued		6,100,000	6,100,000	308,300	308,300
Recognized charge to net earnings	$ 5.9			$ 0.2