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Property, Plant and Equipment, Other (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Mar. 29, 2018
Assets acquired:        
Capital expenditures   $ 3,004.2 $ 2,118.2  
Common units issued in connection with land acquisition (in units) 1,223,242 1,223,242    
Land [Member]        
Assets acquired:        
Property, plant and equipment, additions   $ 85.2    
Capital expenditures   $ 55.2    
Delaware Basin Gas Processing LLC [Member]        
Business Acquisition [Line Items]        
Remaining membership interest acquired       50.00%
Assets acquired:        
Property, plant, and equipment       $ 200.0