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Business Combinations, Purchase Price Allocation (Details) - Azure Midstream Partners, L.P. [Member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Apr. 30, 2017
Assets acquired in business combination: |  |
Current assets |  | $ 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 consideration for acquisition | $ 191.4 |

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