Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

+ References

No definition available.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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- References

No definition available.

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Intangible Assets and Goodwill, Significant Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Identifiable intangible assets [Abstract]
Gross Value	$ 5,136.5	$ 5,343.5
Accumulated Amortization	(1,687.5)	(1,735.1)
Carrying Value	3,449.0	$ 3,608.4	$ 3,690.3
Customer relationship intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	3,200.0
Customer relationship intangibles [Member] \| EFS Midstream [Member]
Identifiable intangible assets [Abstract]
Gross Value	1,409.8
Accumulated Amortization	(160.1)
Carrying Value	$ 1,249.7
Weighted Average Remaining Amortization Period	22 years 4 months 24 days
Customer relationship intangibles [Member] \| State Line and Fairplay [Member]
Identifiable intangible assets [Abstract]
Gross Value	$ 895.0
Accumulated Amortization	(205.1)
Carrying Value	$ 689.9
Weighted Average Remaining Amortization Period	27 years 2 months 12 days
Customer relationship intangibles [Member] \| San Juan Gathering [Member]
Identifiable intangible assets [Abstract]
Gross Value	$ 331.3
Accumulated Amortization	(236.8)
Carrying Value	$ 94.5
Weighted Average Remaining Amortization Period	19 years 9 months 18 days
Customer relationship intangibles [Member] \| Oiltanking Partners L.P. [Member]
Identifiable intangible assets [Abstract]
Gross Value	$ 1,192.5
Accumulated Amortization	(122.2)
Carrying Value	$ 1,070.3
Weighted Average Remaining Amortization Period	24 years
Contract-based intangibles [Member]
Identifiable intangible assets [Abstract]
Carrying Value	$ 254.9
Contract-based intangibles [Member] \| Oiltanking Partners L.P. [Member]
Identifiable intangible assets [Abstract]
Gross Value	293.3
Accumulated Amortization	(245.9)
Carrying Value	$ 47.4
Weighted Average Remaining Amortization Period	3 years 7 months 6 days
Contract-based intangibles [Member] \| Jonah Gas Gathering [Member]
Identifiable intangible assets [Abstract]
Gross Value	$ 224.4
Accumulated Amortization	(171.4)
Carrying Value	$ 53.0
Weighted Average Remaining Amortization Period	22 years
Contract-based intangibles [Member] \| Delaware Basin Gas Processing LLC [Member]
Identifiable intangible assets [Abstract]
Gross Value	$ 82.6
Accumulated Amortization	(15.0)
Carrying Value	$ 67.6
Weighted Average Remaining Amortization Period	7 years