Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue [Abstract]
Revenues	$ 6,922.0	$ 7,964.1	$ 20,155.5	$ 24,783.9
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	2,614.0	3,252.1	8,058.4	9,851.2
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	2,048.4	2,624.9	6,401.7	7,955.5
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	565.6	627.2	1,656.7	1,895.7
NGL Pipelines & Services [Member] | Midstream Services: Natural Gas Processing and Fractionation [Member]
Revenue [Abstract]
Revenues	205.4	279.6	575.8	837.3
NGL Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	254.7	248.2	769.6	767.4
NGL Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	105.5	99.4	311.3	291.0
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	1,521.6	2,478.3	5,023.7	7,952.2
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	1,216.1	2,130.0	4,059.7	6,990.1
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	305.5	348.3	964.0	962.1
Crude Oil Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	189.3	209.1	603.5	598.1
Crude Oil Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	116.2	139.2	360.5	364.0
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	606.9	715.5	1,862.7	2,462.3
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	350.7	440.0	1,097.6	1,627.1
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	256.2	275.5	765.1	835.2
Natural Gas Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	256.2	275.5	765.1	835.2
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	2,179.5	1,518.2	5,210.7	4,518.2
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues	1,966.2	1,299.0	4,593.7	3,867.3
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	213.3	219.2	617.0	650.9
Petrochemical & Refined Products Services [Member] | Midstream Services: Fractionation and Isomerization [Member]
Revenue [Abstract]
Revenues	54.6	43.2	129.0	125.5
Petrochemical & Refined Products Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	115.2	134.4	365.5	393.2
Petrochemical & Refined Products Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	$ 43.5	$ 41.6	$ 122.5	$ 132.2