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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | Nov. 15, 2019 | Nov. 14, 2019 | Aug. 14, 2019 | May 15, 2019 | Feb. 14, 2019 | Sep. 30, 2019
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Cash Distribution | Series A Preferred Units |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |
Preferred unit distribution amount |  |  | $ 37.0 | $ 37.0 | $ 37.0 |
Preferred distributions per unit (in dollars per unit) |  |  | $ 0.525 | $ 0.525 | $ 0.525 |
Cash Distribution | Series B Preferred Units |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |
Preferred unit distribution amount |  |  |  | $ 24.5 |  |
Preferred distributions per unit (in dollars per unit) |  |  |  | $ 30.625 |  |
Forecast | 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 |  |  |  |
Forecast | Cash Distribution | Series B Preferred Units |  |  |  |  |  |
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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