Business Segments, Consolidated Revenues and Expenses (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Consolidated Revenues [Abstract]
Total consolidated revenues		$ 9,155.3	$ 7,482.5
Operating costs and expenses:
Cost of sales	[1]	6,263.0	4,823.0
Other operating costs and expenses	[2]	715.3	752.8
Depreciation, amortization and accretion		498.7	482.8
Asset impairment charges		65.5	1.6
Net losses attributable to asset sales and related matters		10.9	0.1
General and administrative costs		56.3	55.5
Total consolidated costs and expenses		7,609.7	6,115.8
NGL Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		3,583.5	2,968.1
Crude Oil Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		2,165.5	2,038.9
Natural Gas Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		1,586.8	670.6
Petrochemical & Refined Products Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		$ 1,819.5	$ 1,804.9

[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.

[2] Represents the cost of operating our plants, pipelines and other fixed assets excluding depreciation, amortization and accretion charges; asset impairment charges; and net losses (or gains) attributable to asset sales and related matters.