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LEASES (Tables)
12 Months Ended
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 
20224.5 15.1 
20234.5 13.8 
20244.5 12.5 
20254.5 11.1 
2026 and beyond12.6 47.1 
Total lease payments35.1 116.1 
Less: Interest10.8 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:
LeasesLocation in our Consolidated Balance SheetDecember 31, 2020December 31, 2019
 
(Thousands of dollars)
Assets
Operating leasesOther assets$100,154 $15,147 
Finance leaseProperty, plant and equipment28,286 28,286 
Finance leaseAccumulated depreciation(2,451)(1,320)
Total leased assets
$125,989 $42,113 
Liabilities
Current
Operating leasesOperating lease liability$13,610 $1,883 
Finance leaseOther current liabilities2,153 1,949 
Noncurrent
Operating leasesOperating lease liability87,610 13,509 
Finance leaseOther deferred credits22,143 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,
20202019
(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
20202019
(Thousands of dollars)
Operating leasesOperations and maintenance$17,162 $6,803 
Finance lease
Amortization of lease assetsDepreciation and amortization1,131 1,131 
Interest on lease liabilitiesInterest expense2,537 2,721 
Total lease cost$20,830 $10,655 

The following table sets forth information about our leases for the periods indicated:
December 31, 2020December 31, 2019
Weighted average remaining lease term (years)
Operating leases8.310.4
Finance lease7.88.8
Weighted average discount rate (a)
Operating leases3.20%4.58%
Finance lease10.00%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 
20224.5 15.1 
20234.5 13.8 
20244.5 12.5 
20254.5 11.1 
2026 and beyond12.6 47.1 
Total lease payments35.1 116.1 
Less: Interest10.8 14.9 
Present value of lease liabilities$24.3 $101.2