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COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments for Firm Transportation, Storage Contracts and Capital Leases The following table sets forth our firm transportation and storage contract payments for the periods indicated:
 Firm
Transportation
and Storage
Contracts
 
(Millions of dollars)
2021$70.9 
202260.9 
202355.8 
202453.4 
202547.9 
Thereafter227.8 
Total$516.7