
	As of March 31, 2023			As of December 31, 2022
	(In millions of dollars)
Trade Receivables, Net
Billed trade receivables	$	365.6		$	297.7
Allowance for doubtful receivables		(0.6	)		(0.5	)
Trade receivables, net	$	365.0		$	297.2

Inventories1
Finished products	$	124.8		$	98.0
Work-in-process		183.0			242.5
Raw materials		217.9			174.0
Operating supplies		12.0			10.9
Total	$	537.7		$	525.4

Property, Plant and Equipment, Net
Land and improvements	$	37.9		$	28.4
Buildings and leasehold improvements		195.5			185.5
Machinery and equipment		1,243.6			1,232.7
Construction in progress2		159.8			141.3
Property, plant and equipment, gross		1,636.8			1,587.9
Accumulated depreciation and amortization		(599.0	)		(574.9	)
Assets held for sale		—			0.2
Property, plant and equipment, net	$	1,037.8		$	1,013.2

Other Accrued Liabilities
Uncleared cash disbursements	$	25.1		$	13.6
Accrued income taxes and other taxes payable		13.5			8.9
Accrued interest		10.5			9.9
Short-term environmental accrual – Note 7		1.0			1.1
Short-term operating lease liabilities		9.2			9.1
Other – Note 5		21.6			25.8
Total	$	80.9		$	68.4

Long-Term Liabilities
Workers' compensation accrual	$	30.5		$	30.9
Long-term environmental accrual – Note 7		16.5			16.6
Other long-term liabilities		35.8			27.2
Total	$	82.8		$	74.7

At March 31, 2023 and December 31, 2022, the current cost of our inventory exceeded its stated last-in, first-out (“LIFO”) value by $102.5 million and $84.6 million, respectively.

Based on market conditions, we temporarily idled projects within Construction in progress totaling $22.7 million and $21.9 million as of March 31, 2023 and December 31, 2022, respectively, all of which are expected to resume at a future date.