Inventories (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Inventory by Product Type [Abstract]
NGLs		$ 1,725.9		$ 1,725.9		$ 1,888.1
Petrochemicals and refined products		956.1		956.1		642.6
Crude oil		642.8		642.8		758.1
Natural gas		22.0		22.0		14.7
Total		3,346.8		3,346.8		$ 3,303.5
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]
Cost of sales	[1]	6,840.0	$ 3,195.2	13,103.0	$ 8,018.2
Lower of cost or net realizable value adjustments recognized in cost of sales		$ 2.9	$ 13.2	$ 12.9	$ 51.2

[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.