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Shareholders' Equity / Partners' Capital - Distributions (Details) - $ / shares	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020
Class A common shares/units
Class of Stock [Line Items]
Common stock dividend declared (in dollars per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05
Class B common shares
Class of Stock [Line Items]
Common stock dividend declared (in dollars per share)		0.05		0.05
Series D Perpetual Preferred Shares/Units
Class of Stock [Line Items]
Preferred stock, dividend rate (in percent)					6.50%
Preferred shares, dividends declared (in dollars per share)	0.41	0.41	0.41	0.41
Series E Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate (in percent)					6.35%
Preferred shares, dividends declared (in dollars per share)	0.40	0.40	0.40	0.40
Series F Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate (in percent)					5.875%
Preferred shares, dividends declared (in dollars per share)	0.37	0.37	0.37	0.37
Series G Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate (in percent)					5.875%
Preferred shares, dividends declared (in dollars per share)	0.37	0.37	0.37	0.37
Series H Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock, dividend rate (in percent)					6.25%
Preferred shares, dividends declared (in dollars per share)	$ 0.39	$ 0.39	$ 0.39	$ 0.39

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120397183&loc=d3e187085-122770

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