Accounts receivable consist of the following (in millions):


	June 30, 2024		December 31, 2023
Accounts receivable	$	128.1	$	134.0
Income tax receivable	0.1		14.1
Allowances and doubtful accounts:
Doubtful accounts	(4.6)		(5.1)
Sales discounts	(0.6)		(0.2)
Accounts receivable, net	$	123.0	$	142.8

Losses on receivables are estimated based on known troubled accounts and historical experience. Receivables are considered impaired and written off when it is probable that payments due will not be collected. We incurred no expense for uncollectible accounts for the three months ended June 30, 2024 and $0.1 million of expense for the six months ended June 30, 2024, compared to $0.4 million and $0.6 million for the three and six months ended June 30, 2023, respectively.

Inventories at the lower of cost (determined on the FIFO method) or net realizable value consists of the following (in millions):


	June 30, 2024		December 31, 2023
Raw materials	$	49.6	$	50.3
Work in process	24.2		19.8
Finished goods	86.2		88.5
Supplies and other	3.9		4.6

Total Inventory	$	163.9	$	163.2

We had no expense for inventory write-offs and obsolescence in the three months ended June 30, 2024 and $1.5 million of expense for inventory write-offs and obsolescence in the six months ended June 30, 2024, compared to $2.4 million and $3.4 million in the three and six months ended June 30, 2023, respectively.

Property, plant and equipment consists of the following (in millions):


	June 30, 2024		December 31, 2023
Land	$	1.3	$	1.3
Buildings and leasehold improvements	37.2		38.0
Machinery and equipment	184.9		182.8
Construction in progress	16.5		18.0

	239.9		240.1
Less accumulated depreciation	(129.2)		(122.9)

Total	$	110.7	$	117.2

Depreciation expense was $5.0 million and $10.3 million for the three and six months ended June 30, 2024, respectively, compared to $4.5 million and $9.4 million for the three and six months ended June 30, 2023, respectively.

The changes in the carrying amount of goodwill are as follows (in millions):


	Goodwill
Balance, December 31, 2023	$	796.1
Currency translation adjustment	(1.7)
Balance, June 30, 2024	$	794.4


	June 30, 2024						December 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trademarks	$	41.6	$	(29.4)	$	12.2	$	42.0	$	(28.8)	$	13.2
Patents and acquired technologies	248.5		(176.7)		71.8		248.6		(171.9)		76.7
Other	207.2		(65.0)		142.2		207.7		(58.1)		149.6
Total	$	497.3	$	(271.1)	$	226.2	$	498.3	$	(258.8)	$	239.5

Amortization expense for intangible assets is included in “Cost of products sold” and “Selling and general expenses” and was $6.3 million and $12.4 million for the three and six months ended June 30, 2024, respectively, compared to $5.8 million and $11.6 million for the three and six months ended June 30, 2023, respectively. As of June 30, 2024 we had unrealized currency translation adjustments of $0.3 million related to our acquired intangibles from the acquisition of Diros.

Amortization expense for the remainder of 2024, the following four years and thereafter is estimated as follows (in millions):


	Amount
Remainder of 2024	$	13.1
2025	25.0
2026	24.5
2027	22.8
2028	22.6
Thereafter	118.2
Total	$	226.2

Accrued expenses consist of the following (in millions):


	June 30, 2024		December 31, 2023
Accrued rebates and customer incentives	$	21.8	$	17.7
Accrued salaries and wages	25.8		31.5
Accrued taxes and other	6.1		16.7
Other	25.8		27.3
Total	$	79.5	$	93.2

Other long-term liabilities consist of the following (in millions):


	June 30, 2024		December 31, 2023

Accrued compensation and benefits	$	6.6	$	5.9
Other	3.9		4.1
Total	$	10.5	$	10.0