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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table sets forth the maturity of our lease liabilities as of December 31, 2020:
|  | Finance Lease |  | Operating Leases
|  | (Millions of dollars)
2021 |  | $ | 4.5 |  |  | $ | 16.5 |
2022 |  | 4.5 |  |  | 15.1 |
2023 |  | 4.5 |  |  | 13.8 |
2024 |  | 4.5 |  |  | 12.5 |
2025 |  | 4.5 |  |  | 11.1 |
2026 and beyond |  | 12.6 |  |  | 47.1 |
Total lease payments |  | 35.1 |  |  | 116.1 |
Less: Interest |  | 10.8 |  |  | 14.9 |
Present value of lease liabilities |  | $ | 24.3 |  |  | $ | 101.2 |
LeaseAssetsAndLiabilitiesInBalanceSheet [Table Text Block] | The following table sets forth information about our lease assets and liabilities included in our Consolidated Balance Sheet for the periods indicated:
Leases | Location in our Consolidated Balance Sheet |  | December 31, 2020 |  | December 31, 2019
|  |  | (Thousands of dollars)
Assets |  |  |  |  |
Operating leases | Other assets |  | $ | 100,154 |  |  | $ | 15,147 |
Finance lease | Property, plant and equipment |  | 28,286 |  |  | 28,286 |
Finance lease | Accumulated depreciation |  | (2,451) |  |  | (1,320) |
Total leased assets |  |  | $ | 125,989 |  |  | $ | 42,113 |
Liabilities |  |  |  |  |
Current |  |  |  |  |
Operating leases | Operating lease liability |  | $ | 13,610 |  |  | $ | 1,883 |
Finance lease | Other current liabilities |  | 2,153 |  |  | 1,949 |
Noncurrent |  |  |  |  |
Operating leases | Operating lease liability |  | 87,610 |  |  | 13,509 |
Finance lease | Other deferred credits |  | 22,143 |  |  | 24,296 |
Total lease liabilities |  |  | $ | 125,516 |  |  | $ | 41,637 |
The following table sets forth supplemental cash flow information related to our leases:
|  | Years Ended December 31,
|  | 2020 |  | 2019
|  | (Thousands of dollars)
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |
Operating cash flows for operating leases |  | $ | 13,245 |  |  | $ | 6,213 |
Financing cash flows for finance lease |  | $ | 1,949 |  |  | $ | 1,764 |
Right-of-use assets obtained in exchange for operating lease liabilities (noncash) |  | $ | 99,547 |  |  | $ | 4,097 |
Lease, Cost [Table Text Block] | The following table sets forth information about our lease costs for the periods indicated:
|  |  | Years Ended December 31,
| Location in our Consolidated Statement of Income |  | 2020 |  | 2019
|  |  | (Thousands of dollars)
Operating leases | Operations and maintenance |  | $ | 17,162 |  |  | $ | 6,803 |
Finance lease |  |  |  |  |
Amortization of lease assets | Depreciation and amortization |  | 1,131 |  |  | 1,131 |
Interest on lease liabilities | Interest expense |  | 2,537 |  |  | 2,721 |
Total lease cost |  |  | $ | 20,830 |  |  | $ | 10,655 |
The following table sets forth information about our leases for the periods indicated:
| December 31, 2020 |  | December 31, 2019
Weighted average remaining lease term (years) |  |  |
Operating leases | 8.3 |  | 10.4
Finance lease | 7.8 |  | 8.8
Weighted average discount rate (a) |  |  |
Operating leases | 3.20% |  | 4.58%
Finance lease | 10.00% |  | 10.00%
(a) - Our weighted-average discount rates represent the rate implicit in the lease or our incremental borrowing rate for a term equal to the remaining term of the lease.
Finance Lease, Liability, Maturity [Table Text Block] | The following table sets forth the maturity of our lease liabilities as of December 31, 2020:
|  | Finance Lease |  | Operating Leases
|  | (Millions of dollars)
2021 |  | $ | 4.5 |  |  | $ | 16.5 |
2022 |  | 4.5 |  |  | 15.1 |
2023 |  | 4.5 |  |  | 13.8 |
2024 |  | 4.5 |  |  | 12.5 |
2025 |  | 4.5 |  |  | 11.1 |
2026 and beyond |  | 12.6 |  |  | 47.1 |
Total lease payments |  | 35.1 |  |  | 116.1 |
Less: Interest |  | 10.8 |  |  | 14.9 |
Present value of lease liabilities |  | $ | 24.3 |  |  | $ | 101.2 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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