Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Supplemental Balance Sheet Information

	As of March 31, 2025			As of December 31, 2024 As Adjusted1
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	348.2		$	320.5
Allowance for doubtful receivables		(0.8	)		(0.8	)
Trade receivables, net	$	347.4		$	319.7
Inventories
Finished products	$	123.5		$	130.0
Work-in-process		229.2			229.1
Raw materials		205.7			228.7
Operating supplies		14.0			14.1
Inventories	$	572.4		$	601.9
Property, Plant and Equipment, Net
Land and improvements	$	37.7		$	37.2
Buildings and leasehold improvements		272.1			256.3
Machinery and equipment 2		1,343.2			1,337.4
Construction in progress		332.4			297.5
Property, plant and equipment, gross		1,985.4			1,928.4
Accumulated depreciation and amortization		(794.1	)		(767.5	)
Land held for sale		0.3			0.3
Property, plant and equipment, net	$	1,191.6		$	1,161.2
Other Assets
Assets to be conveyed associated with Warrick acquisition 2	$	—		$	18.3
Restricted cash – Note 12		20.0			19.5
Long-term replacement parts		19.8			18.3
Other		22.4			22.5
Other assets	$	62.2		$	78.6
Other Accrued Liabilities
Uncleared cash disbursements	$	11.6		$	24.5
Accrued income taxes and other taxes payable		14.3			11.1
Accrued annual contribution to Salaried VEBA		—			0.7
Accrued interest		10.3			9.9
Short-term environmental accrual – Note 7		0.8			0.7
Current operating lease liabilities		5.7			6.3
Current finance lease liabilities		2.2			2.4
Current deferred compensation plan liabilities - Note 3		6.4			6.7
Other – Note 5		15.6			17.0
Other accrued liabilities	$	66.9		$	79.3
Long-Term Liabilities
Workers' compensation accrual	$	27.3		$	26.8
Long-term environmental accrual – Note 7		17.7			17.7
Other long-term liabilities		39.2			39.5
Long-term liabilities	$	84.2		$	84.0

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

2.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 March 31, 2025, such assets are presented within Machinery and equipment.