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Property, Plant and Equipment, Other (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 29, 2018
Assets acquired: |  |  |  |
Capital expenditures |  | $ 3,004.2 | $ 2,118.2 |
Common units issued in connection with land acquisition (in units) | 1,223,242 | 1,223,242 |  |
Land [Member] |  |  |  |
Assets acquired: |  |  |  |
Property, plant and equipment, additions |  | $ 85.2 |  |
Capital expenditures |  | $ 55.2 |  |
Delaware Basin Gas Processing LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Remaining membership interest acquired |  |  |  | 50.00%
Assets acquired: |  |  |  |
Property, plant, and equipment |  |  |  | $ 200.0

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