XML 113 R58.htm IDEA: XBRL DOCUMENT v3.21.2
Commitments and Contingencies - Crude Oil Supply Agreement (Details) - Crude Oil Supply Agreement
3 Months Ended 9 Months Ended
Aug. 31, 2012
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loss Contingencies [Line Items]          
Renewal term of agreement 1 year        
Notice of non-renewal period prior to expiration 180 days        
Petroleum Segment | Contracted Volume | Supplier Concentration Risk          
Loss Contingencies [Line Items]          
Volume contracted under Crude Oil Supply Agreement as percentage of total crude oil purchases   41.00% 33.00% 43.00% 30.00%