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Subsequent Events - Declaration of Dividends (Details) - $ / shares		3 Months Ended
	May 03, 2018	Mar. 31, 2018	Mar. 31, 2017
Subsequent Event [Line Items]
Quarterly dividend (in dollars per share)		$ 0.05	$ 0.05
Class A common shares/units
Subsequent Event [Line Items]
Quarterly dividend (in dollars per share)		0.05	0.05
Class B common shares
Subsequent Event [Line Items]
Quarterly dividend (in dollars per share)		0.05
Series D Perpetual Preferred Shares/Units
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)		$ 0.41	0.41
Preferred stock, dividend rate, percentage		6.50%
Series E Perpetual Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)		$ 0.40	$ 0.40
Preferred stock, dividend rate, percentage		6.35%
Series F Perpetual Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)		$ 0.37
Preferred stock, dividend rate, percentage		5.875%
Series G Perpetual Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)		$ 0.37
Preferred stock, dividend rate, percentage		5.875%
Subsequent Event | Class A common shares/units | Dividend Declared
Subsequent Event [Line Items]
Quarterly dividend (in dollars per share)	$ 0.05
Subsequent Event | Class B common shares
Subsequent Event [Line Items]
Quarterly dividend (in dollars per share)	0.05
Subsequent Event | Series D Perpetual Preferred Shares/Units | Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)	$ 0.41
Preferred stock, dividend rate, percentage	6.50%
Subsequent Event | Series E Perpetual Preferred Shares | Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)	$ 0.40
Preferred stock, dividend rate, percentage	6.35%
Subsequent Event | Series F Perpetual Preferred Shares | Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)	$ 0.37
Preferred stock, dividend rate, percentage	5.875%
Subsequent Event | Series G Perpetual Preferred Shares | Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in dollars per share)	$ 0.37
Preferred stock, dividend rate, percentage	5.875%

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

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X

- 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.

+ References

No definition available.

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