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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Future Minimum Rental Payments for Firm Transportation, Storage Contracts and Capital Leases | The following table sets forth our capital lease future minimum payments and our firm transportation and storage contract payments for the periods indicated:
|  | Capital Lease (a) |  | Firm Transportation and Storage Contracts
|  | (Millions of dollars)
2019 |  | $ | 4.5 |  |  | $ | 63.7 |
2020 |  | 4.5 |  |  | 51.6 |
2021 |  | 4.5 |  |  | 35.7 |
2022 |  | 4.5 |  |  | 22.4 |
2023 |  | 4.5 |  |  | 17.3 |
Thereafter |  | 21.6 |  |  | 11.7 |
Total |  | $ | 44.1 |  |  | $ | 202.4 |
(a) - At December 31, 2018, $28 million in principal represents noncash financing activities. |  |

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