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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | Aug. 13, 2021 | May 17, 2021 | May 14, 2021 | Feb. 12, 2021 | Jun. 30, 2021
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Series A Preferred Units | Cash Distribution |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Preferred unit distribution amount |  |  | $ 37.0 | $ 37.0 |
Preferred distributions per unit (in dollars per unit) |  |  | $ 0.525 | $ 0.525 |
Series A Preferred Units | Cash Distribution | Forecast |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Preferred unit distribution amount | $ 37.0 |  |  |  |
Preferred distributions per unit (in dollars per unit) | $ 0.525 |  |  |  |
Series B Preferred Units | Other current liabilities |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Amount accrued to distributions payable |  |  |  |  | $ 6.0
Series B Preferred Units | Cash Distribution |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Preferred unit distribution amount |  | $ 24.5 |  |  |
Preferred distributions per unit (in dollars per unit) |  | $ 30.625 |  |  |

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