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Equity (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Equity
Preferred stock stated dividend rate percentage	8.375%	8.375%
Series J 8 3/8% Cumulative Redeemable Preferred Stock
Equity
Preferred stock stated dividend rate percentage	8.375%	8.375%
Redemption price of preferred stock (in dollars per share)	50.00
Premium received on preferred stock issued	7.5
Preferred stock unamortized premium	4.9	5.2

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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