v3.8.0.1
Organization and Basis of Presentation WNRL Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
[1]
Sep. 30, 2017
Sep. 30, 2016
[1]
Dec. 31, 2016
Feb. 27, 2017
Operating Income (Loss)   $ 151.0 $ 127.0 $ 467.0 $ 364.0    
Incentive Distribution, Distribution       $ 38.0   $ 12.5  
Common units issued (units)   108,075,130   108,075,130   102,981,495 5,000,000
Subsequent Event | WNRL Merger              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 0.4921            
Subsequent Event | Minimum              
Incentive Distribution, Distribution $ 60.0            
Subsequent Event | Maximum [Member]              
Incentive Distribution, Distribution $ 160.0            
IDR/GP Transaction | Subsequent Event              
Common units issued (units) 78,000,000            
Western Refining Logistics [Member] | Subsequent Event | WNRL Merger              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 0.5233            
Andeavor [Member] | Subsequent Event | WNRL Merger              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 0.4639            
[1] Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.