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Business Combinations, Purchase Price Allocation (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Mar. 29, 2018 | Dec. 31, 2017 | Apr. 30, 2017 | Dec. 31, 2016
Liabilities assumed in business combination: |  |  |  |  |
Goodwill | $ 5,745.2 |  | $ 5,745.2 |  | $ 5,745.2
Delaware Basin Gas Processing LLC [Member] |  |  |  |  |
Consideration: |  |  |  |  |
Purchase price for remaining 50% equity interest in Delaware Processing | 154.5 |  |  |  |
Fair value of our 50% equity interest in Delaware Processing held before the acquisition | 146.4 |  |  |  |
Total consideration | $ 300.9 |  |  |  |
Assets acquired in business combination: |  |  |  |  |
Current assets, including cash |  | $ 10.8 |  |  |
Property, plant, and equipment |  | 200.0 |  |  |
Total assets acquired |  | 303.3 |  |  |
Liabilities assumed in business combination: |  |  |  |  |
Current liabilities |  | (1.8) |  |  |
Long-term liabilities |  | (0.6) |  |  |
Total liabilities assumed |  | (2.4) |  |  |
Total identifiable net assets |  | 300.9 |  |  |
Goodwill |  | 0.0 |  |  |
Description of Business Combination: |  |  |  |  |
Cash acquired |  | 3.9 |  |  |
Delaware Basin Gas Processing LLC [Member] | Contract-based intangibles [Member] |  |  |  |  |
Assets acquired in business combination: |  |  |  |  |
Intangible assets |  | 82.6 |  |  |
Delaware Basin Gas Processing LLC [Member] | Customer relationship intangibles [Member] |  |  |  |  |
Assets acquired in business combination: |  |  |  |  |
Intangible assets |  | $ 9.9 |  |  |
Azure Midstream Partners, L.P. [Member] |  |  |  |  |
Assets acquired in business combination: |  |  |  |  |
Current assets, including cash |  |  |  | $ 3.1 |
Property, plant, and equipment |  |  |  | 193.1 |
Total assets acquired |  |  |  | 196.2 |
Liabilities assumed in business combination: |  |  |  |  |
Current liabilities |  |  |  | (1.4) |
Long-term liabilities |  |  |  | (3.4) |
Total liabilities assumed |  |  |  | (4.8) |
Total identifiable net assets |  |  |  | $ 191.4 |

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