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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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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 |
2022 |  | 60.9 |
2023 |  | 55.8 |
2024 |  | 53.4 |
2025 |  | 47.9 |
Thereafter |  | 227.8 |
Total |  | $ | 516.7 |

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