Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Information by business segment [Abstract]
Revenues from third parties	$ 4,989.7	$ 7,466.4
Revenues from related parties	15.6	6.1
Intersegment and intrasegment revenues	0.0	0.0
Total revenues	5,005.3	7,472.5
Equity in income (loss) of unconsolidated affiliates	101.1	89.2
Gross operating margin	1,318.5	1,334.4
Property, plant and equipment, net	32,673.3		$ 32,034.7
Investments in unconsolidated affiliates	2,684.1		2,628.5
Intangible assets, net	3,990.9		4,037.2
Goodwill	5,745.2		5,745.2
Segment assets	45,093.5		44,445.6
NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	2,403.8	2,676.3
Equity in income (loss) of unconsolidated affiliates	15.1	11.6
Intangible assets, net	372.5		380.3
Goodwill	2,651.7		2,651.7
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	1,288.6	2,678.0
Equity in income (loss) of unconsolidated affiliates	90.1	59.9
Intangible assets, net	2,349.8		2,377.5
Goodwill	1,841.0		1,841.0
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	550.0	733.9
Equity in income (loss) of unconsolidated affiliates	1.0	0.9
Intangible assets, net	1,079.1		1,087.7
Goodwill	296.3		296.3
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	762.9	1,349.1
Equity in income (loss) of unconsolidated affiliates	(5.1)	(3.4)
Intangible assets, net	189.5		191.7
Goodwill	956.2		956.2
Offshore Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	0.0	35.2
Equity in income (loss) of unconsolidated affiliates	0.0	20.2
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]
Information by business segment [Abstract]
Revenues from third parties	2,402.0	2,674.8
Revenues from related parties	1.8	1.5
Intersegment and intrasegment revenues	3,174.8	2,443.1
Total revenues	5,578.6	5,119.4
Equity in income (loss) of unconsolidated affiliates	15.1	11.6
Gross operating margin	783.7	695.2
Property, plant and equipment, net	12,934.9		12,909.7
Investments in unconsolidated affiliates	740.1		718.7
Intangible assets, net	372.5		380.3
Goodwill	2,651.7		2,651.7
Segment assets	16,699.2		16,660.4
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Revenues from third parties	1,277.5	2,677.0
Revenues from related parties	11.1	1.0
Intersegment and intrasegment revenues	1,499.4	1,277.1
Total revenues	2,788.0	3,955.1
Equity in income (loss) of unconsolidated affiliates	90.1	59.9
Gross operating margin	202.3	214.0
Property, plant and equipment, net	3,896.6		3,550.3
Investments in unconsolidated affiliates	1,848.6		1,813.4
Intangible assets, net	2,349.8		2,377.5
Goodwill	1,841.0		1,841.0
Segment assets	9,936.0		9,582.2
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Revenues from third parties	547.3	730.9
Revenues from related parties	2.7	3.0
Intersegment and intrasegment revenues	124.7	170.0
Total revenues	674.7	903.9
Equity in income (loss) of unconsolidated affiliates	1.0	0.9
Gross operating margin	177.7	204.5
Property, plant and equipment, net	8,551.1		8,620.0
Investments in unconsolidated affiliates	22.3		22.5
Intangible assets, net	1,079.1		1,087.7
Goodwill	296.3		296.3
Segment assets	9,948.8		10,026.5
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Revenues from third parties	762.9	1,349.1
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	242.7	285.6
Total revenues	1,005.6	1,634.7
Equity in income (loss) of unconsolidated affiliates	(5.1)	(3.4)
Gross operating margin	154.8	174.6
Property, plant and equipment, net	3,203.3		3,060.7
Investments in unconsolidated affiliates	73.1		73.9
Intangible assets, net	189.5		191.7
Goodwill	956.2		956.2
Segment assets	4,422.1		4,282.5
Reportable Business Segments [Member] | Offshore Pipelines & Services [Member]
Information by business segment [Abstract]
Revenues from third parties	0.0	34.6
Revenues from related parties	0.0	0.6
Intersegment and intrasegment revenues	0.0	0.4
Total revenues	0.0	35.6
Equity in income (loss) of unconsolidated affiliates	0.0	20.2
Gross operating margin	0.0	46.1
Property, plant and equipment, net	0.0		0.0
Investments in unconsolidated affiliates	0.0		0.0
Intangible assets, net	0.0		0.0
Goodwill	0.0		0.0
Segment assets	0.0		0.0
Eliminations [Member]
Information by business segment [Abstract]
Revenues from third parties	0.0	0.0
Revenues from related parties	0.0	0.0
Intersegment and intrasegment revenues	(5,041.6)	(4,176.2)
Total revenues	(5,041.6)	(4,176.2)
Equity in income (loss) of unconsolidated affiliates	0.0	0.0
Gross operating margin	0.0	$ 0.0
Adjustments [Member]
Information by business segment [Abstract]
Property, plant and equipment, net	4,087.4		3,894.0
Investments in unconsolidated affiliates	0.0		0.0
Intangible assets, net	0.0		0.0
Goodwill	0.0		0.0
Segment assets	$ 4,087.4		$ 3,894.0