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Equity and Capital - Repayment of Debt (Details) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 09, 2011	Mar. 31, 2011
Extinguishment of Debt [Line Items]
Proceeds from Issuance or Sale of Equity	$ 215,400,000
Unsecured Debt [Member]
Extinguishment of Debt [Line Items]
Repayment of fixed rate unsecured notes	$ 161,700,000
Debt Instrument, Maturity Date		Jan. 31, 2011
Parent Company [Member]
Extinguishment of Debt [Line Items]
Forward Contract Indexed to Issuer's Equity, Settlement Date	Mar. 09, 2011
Forward Contract Indexed to Issuer's Equity, Indexed Shares	8.0

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.