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Business Combinations, Purchase Price Allocation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Mar. 29, 2018
Dec. 31, 2017
Apr. 30, 2017
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