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Goodwill - Changes in Net Amounts of Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]        
Goodwill $ 46.6 $ 45.2 $ 46.6 $ 46.6
Goodwill allocated to held for sale assets     (1.4)  
Net 46.6 45.2 45.2 46.6
Impairment (210.0)     (210.0)
New Midland [Member]        
Goodwill [Roll Forward]        
Goodwill 23.2   23.2 23.2
Net 23.2   23.2 23.2
Reporting unit aggregation [1]   (23.2)    
New Delaware [Member]        
Goodwill [Roll Forward]        
Goodwill 23.4     23.4
Net $ 23.4     $ 23.4
Reporting unit aggregation [2]     (23.4)  
Delaware Supersystem [Member]        
Goodwill [Roll Forward]        
Goodwill     23.4  
Goodwill allocated to held for sale assets     (1.4)  
Net     22.0  
Reporting unit aggregation   (22.0) [1] $ 23.4 [2]  
Permian Midland [Member]        
Goodwill [Roll Forward]        
Goodwill   23.2    
Net   23.2    
Reporting unit aggregation [1]   23.2    
Permian Delaware [Member]        
Goodwill [Roll Forward]        
Goodwill   22.0    
Net   22.0    
Reporting unit aggregation [1]   $ 22.0    
[1]

In 2020, as a result of the high degree of operational integration of our Permian gathering and processing assets and management’s increased focus and review of combined operating results within our Permian Midland and Permian Delaware regions, we further aggregated our New Midland and Permian Supersystem reporting units into the Permian Midland and Permian Delaware reporting units, respectively.
[2]

In 2019, we began aggregating the results of Delaware Supersystem activity, including New Delaware. Discrete financial information for New Delaware is no longer available and management now reviews aggregate Delaware Supersystem operating results.