Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Summary of Activities Relating to Company's CARO Liabilities

The following table summarizes activity relating to CARO liabilities (in millions of dollars):

	Year Ended December 31,
	2024			2023		2022
Beginning balance	$	10.9		$	10.1	$	7.2
Liabilities added during the period		—			—		2.3
Liabilities settled during the period		(0.1	)		—		(0.1	)
Accretion expense		0.9			0.8		0.7
Ending balance	$	11.7		$	10.9	$	10.1

Schedule of Changes in Environmental Contingencies

The following table presents the changes in our environmental accrual. We classify the short-term and long-term liabilities within Other accrued liabilities and Long-term liabilities, respectively, on our Consolidated Balance Sheets (in millions of dollars):

	Year Ended December 31,
	2024			2023			2022
Beginning balance	$	17.0		$	17.7		$	16.8
Additional accruals		4.2			1.2			3.2
Less: expenditures		(2.8	)		(1.9	)		(2.3	)
Ending balance	$	18.4		$	17.0		$	17.7