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Shareholders' Equity / Partners' Capital - Common Stock Offerings (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of stock |  | $ 414,100,000 | $ 0 |
Offering cost | $ 600,000 | $ 600,000 | $ 0 |
Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Value of Class A common shares issued | 14,950,000 |  |  |
Common shares, par value (in dollars per share) | $ 0.01 | $ 0.01 |  | $ 0.01
Proceeds from issuance of stock | $ 411,700,000 |  |  |
Offering cost | $ 200,000 |  |  |
At the Market - Common Share Offering Program | Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Value of Class A common shares issued | 86,130,000,000 | 86,130,000,000 |  |
Proceeds from issuance of stock | $ 2,400,000 | $ 2,400,000 |  |
Offering cost | 400,000 | 400,000 |  |
Shares authorized for future issuance, value | 500,000,000.0 | 500,000,000.0 |  |
Shares available for future issuance, value | $ 497,600,000 | $ 497,600,000 |  |

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