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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions	Nov. 16, 2020	Nov. 13, 2020	Aug. 14, 2020	May 15, 2020	Feb. 14, 2020	Sep. 30, 2020
Series A Preferred Units | Cash Distribution
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
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						$ 18.0
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
Series B Preferred Units | Cash Distribution | Forecast
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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