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Shareholders' Equity / Partners' Capital - Share Repurchase (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Feb. 28, 2018
Class A common shares/units |  |  |
Class of Stock [Line Items] |  |  |
Repurchase of shares, authorized amount |  |  | $ 300,000,000
Average price per share of Class A common shares (in dollars per share) | $ 19.36 |  |
Stock repurchased less commission and fees paid | $ 34,900,000 |  |
Remaining repurchase authorization | $ 265,100,000 |  |
Class A common shares/units | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Repurchases of Class A common shares (in shares) | 1,804,163 | 0 |
Preferred Shares/Units |  |  |
Class of Stock [Line Items] |  |  |
Repurchase of shares, authorized amount | $ 250,000,000 |  | $ 250,000,000

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