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Distributions Paid and Payable (Details) (USD $) In Millions, except Share data, unless otherwise specified			1 Months Ended																			9 Months Ended		1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Oct. 31, 2011 Common Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Aug. 31, 2011 Common Stock [Member]	Jul. 31, 2011 Common Stock [Member]	Jun. 30, 2011 Common Stock [Member]	May 31, 2011 Common Stock [Member]	Apr. 30, 2011 Common Stock [Member]	Mar. 31, 2011 Common Stock [Member]	Feb. 28, 2011 Common Stock [Member]	Jan. 31, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]	Aug. 31, 2010 Common Stock [Member]	Jul. 31, 2010 Common Stock [Member]	Jun. 30, 2010 Common Stock [Member]	May 31, 2010 Common Stock [Member]	Apr. 30, 2010 Common Stock [Member]	Mar. 31, 2010 Common Stock [Member]	Feb. 28, 2010 Common Stock [Member]	Jan. 31, 2010 Common Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]	Oct. 31, 2011 Cumulative Redeemable Preferred Stock Class D [Member]	Sep. 30, 2011 Cumulative Redeemable Preferred Stock Class D [Member]	Sep. 30, 2010 Cumulative Redeemable Preferred Stock Class D [Member]	Oct. 31, 2011 Cumulative Redeemable Preferred Stock Class E [Member]	Sep. 30, 2011 Cumulative Redeemable Preferred Stock Class E [Member]	Sep. 30, 2010 Cumulative Redeemable Preferred Stock Class E [Member]
Class of Stock [Line Items]
Dividends paid per common share (in dollars per share)			$ 0.1451875	$ 0.1448750	$ 0.1448750	$ 0.1448750	$ 0.1445625	$ 0.1445625	$ 0.1445625	$ 0.1442500	$ 0.1442500	$ 0.1442500	$ 0.1436250	$ 0.1436250	$ 0.1436250	$ 0.1433125	$ 0.1433125	$ 0.1433125	$ 0.1430000	$ 0.1430000	$ 0.1430000	$ 1.3010625	$ 1.2898125
Dividends payable (in dollars per share)				$ 0.1451875																		$ 0.1451875			$ 0.1536459			$ 0.140625
Preferred stock, shares issued (in shares)	13,900,000	13,900,000																							5,100,000			8,800,000
Preferred stock, issued date																									2004			2006
Preferred stock, dividend rate percentage (in hundredths)																									7.375%			6.75%
Preferred stock, dividend payment terms																									Monthly			Monthly
Dividends paid per preferred share (in dollars per share)																								$ 0.1536459	$ 1.3828131	$ 1.3828131	$ 0.140625	$ 1.265625	$ 1.265625
Preferred stock dividends paid																									$ 7.1	$ 7.1		$ 11.1	$ 11.1
Preferred stock, redemption date																									May 27, 2009			Dec. 07, 2011
Preferred stock, redemption price per share (in dollars per share)																									$ 25			$ 25