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Assets and Liabilities Measured at Fair Value (Tables)
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables present the Company's financial assets and liabilities measured at fair value on a recurring basis, as of September 30, 2023 and December 31, 2022:  

 September 30, 2023
(Millions of dollars)Level 1Level 2Level 3Fair Value
Financial assets
Marketable securities, current
U.S. Government bonds$— $5.9 $— $5.9 
U.S. Corporate bonds— 2.6 — 2.6 
Prepaid expenses and other current assets:
Fuel derivative— — 0.2 0.2 
Marketable securities, non-current
U.S. Corporate bonds— 5.9 — 5.9 
Non U.S. Corporate bonds— 1.5 — 1.5 
Other assets
Deferred compensation plan assets11.5 — — 11.5 
Financial liabilities
Deferred credits and other liabilities
Deferred compensation plan liabilities(18.7)— — (18.7)
$(7.2)$15.9 $0.2 $8.9 
 December 31, 2022
(Millions of dollars)Level 1Level 2Level 3Fair Value
Financial assets
Marketable securities, current
U.S. Government bonds$— $8.8 $— $8.8 
U.S. Corporate bonds— 6.1 — 6.1 
Non U.S. Corporate bonds— 3.0 — 3.0 
Accounts receivable - trade
Interest rate swap derivative— — 1.3 1.3 
Marketable securities, non-current
U.S. Corporate bonds— 4.4 — 4.4 
Other assets
Deferred compensation plan assets9.5 — — 9.5 
Financial liabilities
Deferred credits and other liabilities
Deferred compensation plan liabilities(14.7)— — (14.7)
$(5.2)$22.3 $1.3 $18.4 
Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments
The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at September 30, 2023 and December 31, 2022.

 At September 30, 2023At December 31, 2022
 Carrying Carrying 
(Millions of dollars)AmountFair ValueAmountFair Value
Financial liabilities    
Current and long-term debt, excluding finance leases$(1,673.1)$(1,644.8)$(1,673.3)$(1,643.0)