Inventories (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Inventory by Product Type [Abstract]
NGLs		$ 893.9		$ 1,094.9
Petrochemicals and refined products		199.8		311.5
Crude oil		432.9		674.2
Natural gas		12.2		10.8
Total		1,538.8		$ 2,091.4
Summary of cost of sales and lower of cost or net realizable value adjustments [Abstract]
Cost of sales	[1]	4,823.0	$ 5,835.6
Lower of cost or net realizable value adjustments recognized in cost of sales		$ 38.0	$ 5.4

[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.