Leases (Tables)

12 Months Ended

Dec. 31, 2024

Leases [Abstract]

Schedule of Lease Terms and Discount Rates

The following table summarizes key finance and operating lease terms and discount rates:

	As of December 31,
	2024			2023
Weighted-average remaining lease term (in years):
Finance leases		36.9			38.8
Operating leases		8.9			8.9
Weighted-average discount rate:
Finance leases		5.40	%		5.31	%
Operating leases		4.69	%		4.35	%

Schedule of Lease Assets and Lease Liabilities

The following table summarizes the classification of lease assets and lease liabilities on our Consolidated Balance Sheets (in millions of dollars):

		As of December 31,
Description	Classification	2024		2023
Operating lease assets	Operating lease assets	$	27.2	$	32.6
Finance lease assets	Property, plant and equipment, net	$	14.8	$	14.3
Current operating lease liabilities	Other accrued liabilities	$	6.3	$	8.0
Non-current operating lease liabilities	Long-term portion of operating lease liabilities	$	25.2	$	29.2
Total operating lease liabilities		$	31.5	$	37.2
Current finance lease liabilities	Other accrued liabilities	$	2.4	$	2.1
Non-current finance lease liabilities	Long-term liabilities	$	13.0	$	12.9
Total finance lease liabilities		$	15.4	$	15.0

Components of Lease Cost

The following table summarizes the components of lease cost in our Statements of Consolidated Income (Loss) (in millions of dollars):

	Year Ended December 31,
	2024		2023		2022
Operating lease cost	$	10.2	$	11.6	$	12.1
Short-term lease cost		4.0		4.3		4.3
Finance lease cost:
Amortization of leased assets		2.4		2.4		2.5
Interest on lease liabilities		0.8		0.7		0.3
Total lease cost	$	17.4	$	19.0	$	19.2

Schedule of Maturity of Our Lease Liabilities

The following table presents the maturity of our lease liabilities as of December 31, 2024 (in millions of dollars):

	Finance Leases			Operating Leases
2025	$	3.1		$	7.6
2026		2.5			5.1
2027		1.5			4.2
2028		1.0			3.8
2029		0.7			3.7
Thereafter		26.3			15.6
Total minimum lease payments	$	35.1		$	40.0
Less: interest		(19.7	)		(8.5	)
Present value	$	15.4		$	31.5