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Equity and Distributions, Noncontrolling Interests (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Whitehorn Pipeline Company LLC [Member] |
Noncontrolling Interest |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest | $ 189.6
Western Gas Partners, LP [Member] | Whitehorn Pipeline Company LLC [Member] |
Noncontrolling Interest |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 20.00%
Navigator Holdings Ltd. [Member] | Enterprise Navigator Ethylene Terminal LLC [Member] |
Noncontrolling Interest |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 50.00%
Apache Corporation [Member] | Shin Oak NGL Pipeline [Member] | Maximum [Member] |
Noncontrolling Interest |
Percentage Of Option To Purchase Equity Interest | 33.00%

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