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Property, Plant and Equipment, Other (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Apr. 30, 2017
Liabilities assumed in business combination:      
Cash used for Azure acquisition $ 191.4 $ 0.0  
Azure Midstream Partners, L.P. [Member]      
Business Acquisition [Line Items]      
Business combination, description The acquired business assets, which are located primarily in East Texas, include over 730 miles of natural gas gathering pipelines and two natural gas processing facilities with an aggregate processing capacity of 130 million cubic feet per day. The acquired business serves production from the Haynesville Shale and Bossier, Cotton Valley and Travis Peak formations.    
Environmental liabilities assumed in business combination     $ 2.2
Assets acquired in business combination:      
Current assets     3.1
Property, plant, and equipment     194.2
Total assets acquired     197.3
Liabilities assumed in business combination:      
Current liabilities     1.4
Long-term liabilities     4.5
Total liabilities assumed     $ 5.9
Cash used for Azure acquisition $ 191.4