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Shareholders' Equity / Partners' Capital - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended						6 Months Ended	12 Months Ended
	Oct. 03, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)											$ 0.98403
Series C Convertible Units
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)										$ 0.06517
Class A common shares/units
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)									$ 0.2	0.2	0.2
Class B common shares
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)									0.20	0.20	0.20
Series C Preferred Stock
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)									$ 0.34	$ 1.38	$ 1.375
Preferred Shares dividend rate						5.50%			5.50%	5.50%	5.50%
Series D Perpetual Preferred Shares/Units
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)			$ 0.11								$ 0.80257
Preferred Shares dividend rate					6.50%				6.50%
Preferred stock, dividends per share, declared (in dollars per share)									$ 1.63	$ 1.63
Series E Perpetual Preferred Stock
Class of Stock [Line Items]
Preferred Shares dividend rate					6.35%				6.35%
Preferred stock, dividends per share, declared (in dollars per share)									$ 1.59	1.59
Series F Perpetual Preferred Stock
Class of Stock [Line Items]
Preferred Shares dividend rate				5.875%					5.875%
Preferred stock, dividends per share, declared (in dollars per share)									$ 1.47	1.01
Series G Perpetual Preferred Stock
Class of Stock [Line Items]
Preferred Shares dividend rate			5.875%						5.875%
Preferred stock, dividends per share, declared (in dollars per share)									$ 1.47	0.67
Series H Perpetual Preferred Stock
Class of Stock [Line Items]
Preferred Shares dividend rate		6.25%							6.25%
Preferred stock, dividends per share, declared (in dollars per share)									$ 0.44
Series A Participating Preferred Stock
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)										$ 0.94	$ 1.25
Preferred Shares dividend rate	5.00%						5.00%			5.00%	5.00%
Series B Participating Preferred Stock
Class of Stock [Line Items]
Dividend payable per share (in dollars per share)										$ 0.94	$ 1.25
Preferred Shares dividend rate	5.00%							5.00%	5.00%	5.00%	5.00%
U.S. Federal Tax Authority
Class of Stock [Line Items]
Net operating loss carryforward									$ 275.0

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