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Capital Accounts, Noncontrolling Interests (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Noncontrolling Interest

Noncontrolling interests

$ 1,073.3

$ 1,063.5

Net income attributable to noncontrolling interests

110.1

95.8

$ 66.1

Breviloba LLC [Member]

Noncontrolling Interest

Noncontrolling Interest, Increase from Sale of Parent Equity Interest

440.7

Noncontrolling interests

^[1]

480.4

492.9

Whitehorn Pipeline Company LLC [Member]

Noncontrolling Interest

Noncontrolling Interest, Increase from Sale of Parent Equity Interest

$ 189.6

Noncontrolling interests

^[2]

193.0

198.9

Enterprise Navigator Ethylene Terminal LLC [Member]

Noncontrolling Interest

Noncontrolling interests

^[3]

142.2

124.3

Other [Member]

Noncontrolling Interest

Noncontrolling interests

^[4]

$ 257.7

$ 247.4

Altus Midstream Processing LP [Member] | Breviloba LLC [Member]

Noncontrolling Interest

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

33.00%

Western Gas Partners, LP [Member] | Whitehorn Pipeline Company LLC [Member]

Noncontrolling Interest

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

20.00%

Navigator Ethylene Terminals LLC [Member] | Enterprise Navigator Ethylene Terminal LLC [Member]

Noncontrolling Interest

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

50.00%

[1]	Altus Midstream Processing LP acquired a noncontrolling 33% equity interest in Breviloba, which owns the Shin Oak NGL Pipeline, in July 2019 for $440.7 million in cash.
[2]	An affiliate of Western Gas Partners, LP acquired a noncontrolling 20% equity interest in Whitethorn, which owns the majority of our Midland-to-ECHO 1 pipeline, in June 2018 for $189.6 million in cash.
[3]	Navigator Ethylene Terminals LLC owns a noncontrolling 50% equity interest in ENET, which owns our ethylene export terminal located at Morgan’s Point on the Houston Ship Channel.
[4]	Primarily represents noncontrolling equity interests in NGL fractionation and pipeline businesses.

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