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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2019
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)
2020 |  | $ | 61.6 |
2021 |  | 48.1 |
2022 |  | 40.1 |
2023 |  | 36.4 |
2024 |  | 34.3 |
Thereafter |  | 177.9 |
Total |  | $ | 398.4 |

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