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