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Shareholders' Equity / Partners' Capital - Redemption of Series A and B Participating Preferred Shares (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 03, 2017 market shares | Dec. 31, 2013 | Mar. 31, 2014 | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) |  |  |  | 38,350,000 | 37,010,000 |
Preferred shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |
Conversion ratio | 1.13106 |  |  |  |  |
Series B Participating Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) | 4,400,000 |  |  |  |  |
Cumulative annual cash dividend rate | 5.00% |  | 5.00% | 5.00% | 5.00% | 5.00%
Series A Participating Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) | 5,060,000 |  |  |  |  |
Cumulative annual cash dividend rate | 5.00% | 5.00% |  | 5.00% | 5.00% | 5.00%
Preferred shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |
Conversions (in shares) | 12,398,276 |  |  |  |  |
Class A common shares/units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percent of cumulative change in value of an index | 50.00% |  |  |  |  |
Number of markets used in calculation | market | 20 |  |  |  |  |
Preferred stock redemption premium | $ |  |  |  | $ 42.4 |  |

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695 + Details
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