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Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,660.2		$ 2,660.2		$ 2,677.3
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	113.4	$ 92.3	315.2	$ 269.8
Unamortized excess cost amounts by business segment:
Unamortized excess cost amounts	43.4		43.4		45.2
Equity method investment amortization of excess cost	0.6	0.5	1.6	1.6
Income Statement Data:
Revenues	401.6	328.9	1,116.7	991.9
Operating income	249.3	193.6	682.8	589.0
Net income	247.5	192.0	688.0	585.5
NGL Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	18.8	15.9	53.3	45.0
Unamortized excess cost amounts by business segment:
Unamortized excess cost amounts	$ 23.2		$ 23.2		24.1
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	$ 25.9		$ 25.9		24.8
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	$ 32.0		$ 32.0		33.7
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	$ 17.3		$ 17.3		17.3
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	$ 37.2		$ 37.2		38.9
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	$ 321.1		$ 321.1		331.9
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	$ 36.2		$ 36.2		35.8
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	$ 165.8		$ 165.8		165.4
NGL Pipelines & Services [Member] | Delaware Basin Gas Processing LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%		50.00%
Investments in unconsolidated affiliates	$ 107.3		$ 107.3		102.6
Crude Oil Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	95.9	78.4	266.3	234.3
Unamortized excess cost amounts by business segment:
Unamortized excess cost amounts	$ 18.4		$ 18.4		19.0
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	$ 1,378.4		$ 1,378.4		1,393.8
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	$ 384.5		$ 384.5		377.9
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	$ 66.9		$ 66.9		52.9
Natural Gas Pipelines & Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	$ 0.9	1.0	$ 2.8	2.9
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	$ 21.2		$ 21.2		21.7
Petrochemical & Refined Products Services [Member]
Equity in income (loss) of unconsolidated affiliates by business segment [Abstract]
Equity in income (loss) of unconsolidated affiliates	(2.2)	$ (3.0)	(7.2)	$ (12.4)
Unamortized excess cost amounts by business segment:
Unamortized excess cost amounts	$ 1.8		$ 1.8		2.1
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	$ 61.4		$ 61.4		62.3
Petrochemical & Refined Products Services [Member] | Other Unconsolidated Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 5.0		$ 5.0		$ 18.3

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