Business Combinations (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended			14 Months Ended
	Feb. 28, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 13, 2015
Description of Business Combinations:
Cash paid to acquire business				$ 1,000.0	$ 1,056.5	$ 2,416.8
Intangible assets reclassified to goodwill					1,454.1
EFS Midstream Contract with Producers [Member]
Description of Business Combinations:
Contractual obligation			$ 270.0	$ 270.0	$ 270.0
Contract term				10 years	10 years
Eagle Ford Midstream Assets [Member]
Description of Business Combinations:
Business acquisition, description				The EFS Midstream System includes approximately 460 miles of gathering pipelines, 11 central gathering plants, 171 thousand barrels per day of condensate stabilization capacity and 1.0 billion cubic feet per day of associated natural gas treating capacity.
Total consideration for acquisition					$ 2,056.5
Revenues from acquired assets			117.8
Net income from acquired assets			$ 59.9
Oiltanking Partners L.P. [Member]
Description of Business Combinations:
Business acquisition, description				Oiltanking owned marine terminals located on the Houston Ship Channel and at the Port of Beaumont with a total of 12 ship and barge docks and approximately 26 MMBbls of crude oil and petroleum products storage capacity. Oiltanking’s marine terminal on the Houston Ship Channel is connected by pipeline to our Mont Belvieu, Texas complex and is integral to our growing LPG export, crude oil storage and octane enhancement and propylene businesses. Our ECHO facility is also connected to Oiltanking’s system.
Total consideration for acquisition						$ 4,400.0	$ 6,020.0
Number of common units issued for each subordinated unit converted (in units)						1
Noncontrolling interests acquired					1,400.0
Number of units owned upon conversion (in units)						54,799,604
Limited partner interests acquired		65.90%				65.90%
Intangible assets reclassified to goodwill					$ 1,454.1
Revenues from acquired assets		$ 57.5
Net income from acquired assets		$ 8.1
Oiltanking Partners L.P. - Step 1 [Member]
Description of Business Combinations:
Common units acquired (in units)						15,899,802
Subordinated units acquired (in units)						38,899,802
Total consideration for acquisition						$ 4,609.8
Cash paid to acquire business						$ 2,210.0
Common units issued in connection with acquisition						54,807,352
Cash paid to assume notes receivable						$ 228.3
Taxable income, goodwill amortization period						15 years
Acquisition related costs						$ 3.8
Oiltanking Partners L.P. - Step 2 [Member]
Description of Business Combinations:
Common units issued in connection with acquisition	36,827,517
Common units exchanged for each Oiltanking unit (in units)	1.3
Intangible assets reclassified to goodwill	$ 1,460.0