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Inventories (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Inventory by Product Type [Abstract]
NGLs		$ 1,658.6		$ 1,658.6		$ 917.4
Petrochemicals and refined products		198.6		198.6		161.5
Crude oil		467.0		467.0		516.3
Natural gas		11.6		11.6		14.6
Total		2,335.8		2,335.8		$ 1,609.8
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]
Cost of sales	[1]	6,838.9	$ 5,049.6	20,371.2	$ 15,116.4
Lower of cost or net realizable value adjustments recognized within cost of sales		$ 1.7	$ 1.7	$ 4.3	$ 7.7
[1] Cost of sales is a component of "Operating costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations. Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.

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Carrying amount as of the balance sheet date of crude oil inventories.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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