Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue [Abstract]
Revenues	$ 9,450.1	$ 5,751.0	$ 18,605.4	$ 13,233.5
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	3,587.1	2,476.3	7,170.6	5,444.4
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	2,975.8	1,934.1	5,981.4	4,353.3
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	611.3	542.2	1,189.2	1,091.1
NGL Pipelines & Services [Member] | Midstream Services: Natural Gas Processing and Fractionation [Member]
Revenue [Abstract]
Revenues	251.5	181.9	434.9	370.4
NGL Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	235.5	249.9	510.1	514.9
NGL Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	124.3	110.4	244.2	205.8
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	2,503.5	1,463.2	4,669.0	3,502.1
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	2,139.3	1,146.7	3,978.2	2,843.6
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	364.2	316.5	690.8	658.5
Crude Oil Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	249.7	195.8	458.5	414.2
Crude Oil Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	114.5	120.7	232.3	244.3
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	709.1	585.2	2,295.9	1,255.8
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	475.6	347.7	1,810.9	746.9
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	233.5	237.5	485.0	508.9
Natural Gas Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	233.5	237.5	485.0	508.9
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	2,650.4	1,226.3	4,469.9	3,031.2
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues	2,386.9	1,030.0	3,985.8	2,627.5
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	263.5	196.3	484.1	403.7
Petrochemical & Refined Products Services [Member] | Midstream Services: Fractionation and Isomerization [Member]
Revenue [Abstract]
Revenues	80.1	38.6	133.6	74.4
Petrochemical & Refined Products Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	124.2	115.4	240.9	250.3
Petrochemical & Refined Products Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	$ 59.2	$ 42.3	$ 109.6	$ 79.0