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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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