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Business Combinations, Purchase Price Allocation (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 29, 2018 | Dec. 31, 2017
Liabilities assumed in business combination: |  |  |
Goodwill | $ 5,745.2 |  | $ 5,745.2
Delaware Basin Gas Processing LLC [Member] |  |  |
Consideration: |  |  |
Cash paid for remaining 50% equity interest in Delaware Processing | 153.6 |  |
Fair value of our 50% equity interest in Delaware Processing held before the acquisition | 146.4 |  |
Total consideration | 300.0 |  |
Assets acquired in business combination: |  |  |
Other current assets, including cash of $3.8 million |  | $ 12.7 |
Property, plant, and equipment |  | 200.0 |
Total assets acquired |  | 301.9 |
Liabilities assumed in business combination: |  |  |
Current liabilities |  | (1.3) |
Long-term liabilities |  | (0.6) |
Total liabilities assumed |  | (1.9) |
Total assets acquired less liabilities assumed |  | 300.0 |
Total consideration given for ownership interests | $ 300.0 |  |
Goodwill |  | 0.0 |
Description of Business Combination: |  |  |
Cash acquired |  | 3.8 |
Delaware Basin Gas Processing LLC [Member] | Customer relationship intangibles [Member] |  |  |
Assets acquired in business combination: |  |  |
Intangible assets |  | 10.4 |
Delaware Basin Gas Processing LLC [Member] | Contract-based intangibles [Member] |  |  |
Assets acquired in business combination: |  |  |
Intangible assets |  | $ 78.8 |

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