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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
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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