Date the declared dividend will be paid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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- Definition

The amount per share used to calculated dividend payments on preferred stock.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent Events (Dividends Declared and Distributions Per Unit) (Details) - $ / shares			12 Months Ended
	Feb. 17, 2016	Jun. 28, 2013	Dec. 31, 2015
Series E Preferred Stock and Unit
Subsequent Event [Line Items]
Annual rate of dividend per share (in dollars per share)			$ 1.75
Series F Preferred Stock and Unit
Subsequent Event [Line Items]
Annual rate of dividend per share (in dollars per share)			1.65625
Series G Preferred Stock and Unit
Subsequent Event [Line Items]
Annual rate of dividend per share (in dollars per share)		$ 0.334550	1.46875
Series H Preferred Stock and Unit
Subsequent Event [Line Items]
Annual rate of dividend per share (in dollars per share)			1.84375
Series I Preferred Stock and Unit
Subsequent Event [Line Items]
Annual rate of dividend per share (in dollars per share)			$ 1.588
Subsequent event \| Series E Preferred Stock and Unit
Subsequent Event [Line Items]
Dividend and distribution amount (per share)	$ 0.437500
Dividend and distribution payable date	Mar. 31, 2016
Dividend and distribution payable to holders of record on (date)	Mar. 15, 2016
Annual rate of dividend per share (in dollars per share)	$ 1.750
Subsequent event \| Series F Preferred Stock and Unit
Subsequent Event [Line Items]
Dividend and distribution amount (per share)	$ 0.414063
Dividend and distribution payable date	Mar. 31, 2016
Dividend and distribution payable to holders of record on (date)	Mar. 15, 2016
Annual rate of dividend per share (in dollars per share)	$ 1.656
Subsequent event \| Series G Preferred Stock and Unit
Subsequent Event [Line Items]
Dividend and distribution amount (per share)	$ 0.367188
Dividend and distribution payable date	Mar. 31, 2016
Dividend and distribution payable to holders of record on (date)	Mar. 15, 2016
Annual rate of dividend per share (in dollars per share)	$ 1.469
Subsequent event \| Series H Preferred Stock and Unit
Subsequent Event [Line Items]
Dividend and distribution amount (per share)	$ 0.460938
Dividend and distribution payable date	Mar. 31, 2016
Dividend and distribution payable to holders of record on (date)	Mar. 15, 2016
Annual rate of dividend per share (in dollars per share)	$ 1.844
Subsequent event \| Series I Preferred Stock and Unit
Subsequent Event [Line Items]
Dividend and distribution amount (per share)	$ 0.396875
Dividend and distribution payable date	Mar. 31, 2016
Dividend and distribution payable to holders of record on (date)	Mar. 15, 2016
Annual rate of dividend per share (in dollars per share)	$ 1.588
Subsequent event \| Common stock and common unit
Subsequent Event [Line Items]
Dividend and distribution amount (per share)	$ 0.880000
Dividend and distribution payable date	Mar. 31, 2016
Dividend and distribution payable to holders of record on (date)	Mar. 15, 2016
Annual rate of dividend per share (in dollars per share)	$ 3.520