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Property, Plant and Equipment, Other (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 29, 2018
Assets acquired: |  |  |  |
Capital expenditures | $ 4,223.2 | $ 3,101.8 | $ 2,984.1 |
Common units issued in connection with land acquisition (in units) | 1,223,242 |  |  |
Sale of Assets: |  |  |  |
Proceeds from asset sales | $ 161.2 | 40.1 | 46.5 |
Gains attributable to asset sales | 28.7 | 10.7 | 2.5 |
Land [Member] |  |  |  |
Assets acquired: |  |  |  |
Property, plant and equipment, additions | 85.2 |  |  |
Capital expenditures | 55.2 |  |  |
Red River System [Member] |  |  |  |
Sale of Assets: |  |  |  |
Proceeds from asset sales | 134.9 | 0.0 | 0.0 |
Gains attributable to asset sales | $ 20.6 | $ 0.0 | $ 0.0 |
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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