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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lessee, Lease
Leases are reflected in the following balance sheet accounts:
(Millions of dollars)ClassificationDecember 31,
2020		December 31,
2019
Assets
Operating (Right-of-use)Other Assets$147.7 $124.2 
Finance
Property, plant, and equipment, at cost, less accumulated depreciation of $2.8 in 2020 and $2.2 in 2019
2.6 3.0 
Total leased assets$150.3 $127.2 
(Millions of dollars)ClassificationDecember 31,
2020		December 31,
2019
Liabilities
Current
     OperatingTrade accounts payable and accrued liabilities$7.8 $6.8 
     FinanceCurrent maturities of long-term debt 1.2 1.2 
Noncurrent
     OperatingDeferred credits and other liabilities142.5 118.5 
     FinanceLong-term debt, including capitalized lease obligations0.9 1.2 
Total lease liabilities$152.4 $127.7 
Lease, Cost Lease Cost:
Year Ended December 31,
(Millions of dollars)Classification20202019
Operating lease costStation and other operating expenses$16.6 $14.5 
Finance lease cost
   Amortization of leased assetsDepreciation & amortization expense1.3 1.2 
   Interest on lease liabilitiesInterest expense0.1 0.1 
Net lease costs$18.0 $15.8 


Cash flow information:
Year Ended December 31,
(Millions of dollars)20202019
Cash paid for amounts included in the measurement of liabilities
   Operating cash flows required by operating leases$15.5 $13.8 
   Operating cash flows required by finance leases$0.1 $0.1 
   Financing cash flows required by finance leases$1.4 $1.4 
Lease Term and Discount Rate:
Year Ended December 31,
2020
Weighted average remaining lease term (years)
   Finance leases2.0
   Operating leases15.7
Weighted average discount rate
    Finance leases4.2 %
   Operating leases5.7 %
Maturity of Operating Lease Liability
Maturity of Lease Liabilities:
(Millions of dollars)Operating leasesFinance leases
2021$16.8 $1.2 
202215.9 0.7 
202315.4 0.3 
202414.9 — 
202514.2 — 
After 2025166.9 — 
Total lease payments244.1 2.2 
 less: interest93.8 0.1 
Present value of lease liabilities$150.3 $2.1 
Maturity of Finance Lease Liabilities
Maturity of Lease Liabilities:
(Millions of dollars)Operating leasesFinance leases
2021$16.8 $1.2 
202215.9 0.7 
202315.4 0.3 
202414.9 — 
202514.2 — 
After 2025166.9 — 
Total lease payments244.1 2.2 
 less: interest93.8 0.1 
Present value of lease liabilities$150.3 $2.1