Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Jul. 16, 2012
Junior Convertible Subordinated Debentures Redeemed [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.25%
Junior Convertible Subordinated Debentures, Principal Amount Redeemed		$ 436.7
Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.25%
Convertible Preferred Securities, Redemption Date, Actual	July 16, 2012
Convertible Preferred Securities, Cash Paid By Entity At Redemption		$ 421.2