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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Summary of Goodwill
The following table summarizes the goodwill of our various reporting units (in millions):
Impairment during the
nine months ended
December 31, 2019September 30, 2020September 30, 2020
Gathering and Processing
Arrow$45.9 $— $45.9 
Powder River Basin80.3 80.3 — 
Marketing, Supply and Logistics
NGL Marketing and Logistics92.7 — 92.7 
Total$218.9 $80.3 $138.6