Supplemental Balance Sheet Information

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Balance Sheet Information

2. Supplemental Balance Sheet Information

	As of December 31,
	2022			2021
	(In millions of dollars)
Trade Receivables, net
Billed trade receivables	$	297.7		$	333.5
Allowance for doubtful receivables		(0.5	)		(0.8	)
Trade receivables, net	$	297.2		$	332.7
Inventories
Finished products	$	98.0		$	90.3
Work-in-process		242.5			162.2
Raw materials		174.0			143.0
Operating supplies		10.9			9.1
Total	$	525.4		$	404.6
Property, Plant and Equipment, net
Land and improvements	$	28.4		$	26.0
Buildings and leasehold improvements		185.5			179.0
Machinery and equipment		1,232.7			1,151.5
Construction in progress1		141.3			75.3
Property, plant and equipment, gross		1,587.9			1,431.8
Accumulated depreciation and amortization		(574.9	)		(480.4	)
Assets held for sale		0.2			3.8
Property, plant and equipment, net	$	1,013.2		$	955.2
Other Accrued Liabilities
Uncleared cash disbursements	$	13.6		$	10.9
Accrued income taxes and other taxes payable		8.9			9.5
Accrued interest		9.9			9.9
Short-term environmental accrual – Note 10		1.1			2.6
Other – Note 3 and Note 8		34.9			25.5
Total	$	68.4		$	58.4
Long-Term Liabilities
Workers' compensation accruals	$	30.9		$	31.9
Long-term environmental accrual – Note 10		16.6			14.2
Other long-term liabilities		27.2			26.4
Total	$	74.7		$	72.5

1Based on market conditions, we temporarily idled projects within Construction in progress totaling $21.9 million and $24.9 million as of December 31, 2022 and December 31, 2021, respectively, all of which are expected to resume at a future date.