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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | May 15, 2020 | Feb. 14, 2020 | Mar. 31, 2020
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Cash Distribution | Series A Preferred Units |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Preferred unit distribution amount |  | $ 37.0 |
Preferred distributions per unit (in dollars per unit) |  | $ 0.525 |
Cash Distribution | Series A Preferred Units | Forecast |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Preferred unit distribution amount | $ 37.0 |  |
Preferred distributions per unit (in dollars per unit) | $ 0.525 |  |
Cash Distribution | Series B Preferred Units | Forecast |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Preferred unit distribution amount | $ 24.5 |  |
Preferred distributions per unit (in dollars per unit) | $ 30.625 |  |
Other current liabilities | Series B Preferred Units |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Amount accrued to distributions payable |  |  | $ 18.0

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