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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 1						Level 2						Level 3						Fair 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 assets						11.5						—						—						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 1						Level 2						Level 3						Fair 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 assets						9.5						—						—						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, 2023												At December 31, 2022
						Carrying												Carrying
(Millions of dollars)						Amount						Fair Value						Amount						Fair Value
Financial liabilities
Current and long-term debt, excluding finance leases						$	(1,673.1)					$	(1,644.8)					$	(1,673.3)					$	(1,643.0)

X

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-11

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- References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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