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Inventories (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory by Product Type [Abstract]
NGLs		$ 1,094.9	$ 647.7
Petrochemicals and refined products		311.5	264.7
Crude oil		674.2	593.4
Natural gas		10.8	16.3
Total		2,091.4	1,522.1
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]
Cost of sales	[1]	22,065.8	26,789.8	$ 21,487.0
Lower of cost or net realizable value adjustments recognized in cost of sales		$ 22.7	$ 11.5	$ 9.1
[1] Cost of sales is a component of “Operating costs and expenses,” as presented on our 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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Carrying amount as of the balance sheet date of natural gas inventories.

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Carrying amount as of the balance sheet date of petrochemicals and refined products 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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Carrying amount as of the balance sheet date of liquid hydrocarbon components recovered from natural gas.

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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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