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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions				6 Months Ended
	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Jun. 30, 2018	Jun. 30, 2017
Series A Preferred Units
Partners Capital and Distribution [Line Items]
Distribution of units in lieu of cash (units)				1,393,926	2,601,300
Series B Preferred Units
Partners Capital and Distribution [Line Items]
Amount accrued to distributions payable				$ 6.0
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 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
In-Kind Unit Distribution | Series A Preferred Units
Partners Capital and Distribution [Line Items]
Preferred unit distribution amount			$ 37.0
Distribution of units in lieu of cash (units)			1,393,926
Preferred distributions per unit (in dollars per unit)			$ 0.525
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

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Number of units distributed for payment of a unit distribution to unit-holder of limited partnership (LP).

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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