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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 29, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates		$ 2,603.4		$ 2,603.4			$ 2,659.4
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates		112.0	$ 113.4	350.0	$ 315.2
Income Statement Data:
Revenues		439.1	401.6	1,296.4	1,116.7
Operating income		258.0	249.3	789.8	682.8
Net income		256.9	247.5	785.6	688.0
NGL Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates		$ 28.3	18.8	$ 87.1	53.3
NGL Pipelines & Services [Member] | Venice Energy Service Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		13.10%		13.10%
Investments in unconsolidated affiliates		$ 24.7		$ 24.7			25.7
NGL Pipelines & Services [Member] | K/D/S Promix, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 31.2		$ 31.2			30.9
NGL Pipelines & Services [Member] | Baton Rouge Fractionators LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		32.20%		32.20%
Investments in unconsolidated affiliates		$ 16.7		$ 16.7			17.0
NGL Pipelines & Services [Member] | Skelly-Belvieu Pipeline Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 36.6		$ 36.6			37.0
NGL Pipelines & Services [Member] | Texas Express Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		35.00%		35.00%
Investments in unconsolidated affiliates		$ 328.6		$ 328.6			314.4
NGL Pipelines & Services [Member] | Texas Express Gathering LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		45.00%		45.00%
Investments in unconsolidated affiliates		$ 44.7		$ 44.7			35.9
NGL Pipelines & Services [Member] | Front Range Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		33.30%		33.30%
Investments in unconsolidated affiliates		$ 175.7		$ 175.7			165.7
NGL Pipelines & Services [Member] | Delaware Basin Gas Processing LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		100.00%		100.00%
Investments in unconsolidated affiliates	[1]	$ 0.0		$ 0.0			107.3
Remaining membership interest acquired						50.00%
Crude Oil Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates		$ 83.7	95.9	$ 265.1	266.3
Crude Oil Pipelines & Services [Member] | Seaway Crude Pipeline Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 1,370.3		$ 1,370.3			1,378.9
Crude Oil Pipelines & Services [Member] | Eagle Ford Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 385.1		$ 385.1			385.2
Crude Oil Pipelines & Services [Member] | Eagle Ford Terminals Corpus Christi LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 104.4		$ 104.4			75.1
Natural Gas Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates		$ 2.1	0.9	$ 4.7	2.8
Natural Gas Pipelines & Services [Member] | White River Hub, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 20.4		$ 20.4			20.8
Natural Gas Pipelines & Services [Member] | Old Ocean Pipeline, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 1.6		$ 1.6			0.0
Equity method investment, description				The 24-inch diameter Old Ocean Pipeline originates in Maypearl, Texas in Ellis County and extends south approximately 240 miles to Sweeny, Texas in Brazoria County. ETP serves as operator of the pipeline.
Petrochemical & Refined Products Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates		$ (2.1)	$ (2.2)	$ (6.9)	$ (7.2)
Petrochemical & Refined Products Services [Member] | Centennial Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%		50.00%
Investments in unconsolidated affiliates		$ 59.5		$ 59.5			60.8
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates		$ 3.9		$ 3.9			$ 4.7
[1] In March 2018, we acquired the remaining 50% membership interest in our Delaware Processing joint venture. See Note 11 for information regarding this recent acquisition.

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