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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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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions						9 Months Ended
	Nov. 15, 2018	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Sep. 30, 2018	Sep. 30, 2017
Series A Preferred Units
Partners Capital and Distribution [Line Items]
Distribution of units in lieu of cash (units)						1,393,926	3,941,096
Series B Preferred Units
Partners Capital and Distribution [Line Items]
Amount accrued to distributions payable						$ 18.0
Cash Distribution \| Series A Preferred Units
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
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
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