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Shareholders' Equity / Partners' Capital - At the Market Common Share Offering Program (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of class A common shares |  | $ 414,100,000 | $ 0 | $ 0
Class A Common Shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares issued (in shares) | 14,950,000 |  |  |
Proceeds from issuance of class A common shares | $ 411,700,000 |  |  |
Stock issuance costs | 200,000 | 600,000 | $ 0 | $ 0
At the Market - Common Share Offering Program | Class A Common Shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Capital shares amount authorized for future issuance | 500,000,000.0 | $ 500,000,000.0 |  |
Common stock, shares issued (in shares) |  | 86,130,000,000 |  |
Proceeds from issuance of class A common shares |  | $ 2,400,000 |  |
Stock issuance costs |  | 400,000 |  |
Shares reserved for future issuance | $ 497,600,000 | $ 497,600,000 |  |

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