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Supplemental Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Supplemental Balance Sheet Information


	As of June 30, 2025			As of December 31, 2024 As Adjusted1
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	379.5		$	320.5
Allowance for doubtful receivables		(0.8	)		(0.8	)
Trade receivables, net	$	378.7		$	319.7

Inventories
Finished products	$	139.8		$	130.0
Work-in-process		219.4			229.1
Raw materials		221.7			228.7
Operating supplies		14.7			14.1
Inventories	$	595.6		$	601.9

Property, Plant and Equipment, Net
Land and improvements	$	38.5		$	37.2
Buildings and leasehold improvements		319.5			256.3
Machinery and equipment 2		1,558.4			1,337.4
Construction in progress		110.4			297.5
Property, plant and equipment, gross		2,026.8			1,928.4
Accumulated depreciation and amortization		(822.2	)		(767.5	)
Land held for sale		0.3			0.3
Property, plant and equipment, net	$	1,204.9		$	1,161.2

Other Assets
Assets to be conveyed associated with Warrick acquisition 2	$	—		$	18.3
Restricted cash – Note 12		19.8			19.5
Long-term replacement parts		24.5			18.3
Other		23.6			22.5
Other assets	$	67.9		$	78.6

Other Accrued Liabilities
Uncleared cash disbursements	$	4.3		$	24.5
Accrued income taxes and other taxes payable		11.4			11.1
Accrued annual contribution to Salaried VEBA		—			0.7
Accrued interest		10.0			9.9
Short-term environmental accrual – Note 7		0.7			0.7
Current operating lease liabilities		5.4			6.3
Current finance lease liabilities		2.2			2.4
Current deferred compensation plan liabilities - Note 3		6.6			6.7
Other – Note 5		14.5			17.0
Other accrued liabilities	$	55.1		$	79.3

Long-Term Liabilities
Workers' compensation accrual	$	27.1		$	26.8
Long-term environmental accrual – Note 7		17.5			17.7
Other long-term liabilities		40.2			39.5
Long-term liabilities	$	84.8		$	84.0

Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.

During the quarter ended March 31, 2025, $18.3 million of certain assets associated with our acquisition of Warrick were conveyed to us and placed in service. At June 30, 2025, such assets are presented within Machinery and equipment.