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Assets and Liabilities Measure at Fair Value
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measure at Fair Value Assets and Liabilities Measured at Fair Value
 
The Company carries certain assets and liabilities at fair value in its Consolidated Balance Sheets. The fair value hierarchy is based on the quality of inputs used to measure fair value, with Level 1 being the highest quality and Level 3 being the lowest quality. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1. Level 3 inputs are unobservable inputs which reflect assumptions about pricing by market participants.
 
At the balance sheet date, the fair value of commodity derivatives contracts was determined using NYMEX quoted values and the value of the Interest rate swap derivative was derived by using level 3 inputs, but the balances for each were immaterial. The carrying value of the Company’s Cash and cash equivalents, Accounts receivable-trade, Trade accounts payable, interest rate swap contracts and accrued liabilities approximates fair value. See also Note 12 "Financial Instruments and Risk Management in these consolidated financial statements for the period ended December 31, 2020, for more information.
 
The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at December 31, 2020 and 2019. The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table excludes Cash and cash equivalents, Accounts receivable-trade, and Trade accounts payable and accrued liabilities, all of which had fair values approximating carrying amounts. The fair value of Current and Long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain financial guarantees and letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal.
 
 December 31, 2020December 31, 2019
 Carrying Carrying 
(Millions of dollars)AmountFair ValueAmountFair Value
Financial liabilities    
Current and long-term debt$(1,002.4)$(1,029.9)$(1,038.1)$(1,069.4)