
	June 28, 2025						December 28, 2024
(in millions)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets subject to amortization:
Patents	$	45.2	$	(18.8)	$	26.4	$	44.0	$	(17.5)	$	26.5
Acquired technologies	28.6		(17.1)		11.5		27.9		(15.8)		12.1
Customer relationships	24.6		(13.9)		10.7		24.6		(13.3)		11.3
Trademarks	14.0		(7.8)		6.2		13.7		(7.2)		6.5

Licenses	2.0		(1.4)		0.6		2.3		(1.2)		1.1
Licenses-related party	7.5		(7.3)		0.2		7.5		(7.1)		0.4
Other	6.6		(4.5)		2.1		8.1		(4.4)		3.7
Total intangible assets subject to amortization, net	$	128.5	$	(70.8)	$	57.7	$	128.1	$	(66.5)	$	61.6

Finite lived intangible assets have a weighted-average amortization period ranging from eleven years to fourteen years. Total amortization expense for the three months ended June 28, 2025 and June 29, 2024 was $2.0 million and $2.6 million, respectively. Total amortization expense for the six months ended June 28, 2025 and June 29, 2024 was $4.1 million and $5.1 million, respectively.

Total renewal costs capitalized for patents and trademarks for the three months ended June 28, 2025 and June 29, 2024 were $0.4 million and $0.3 million, respectively. Total renewal costs capitalized for patents and trademarks for the six months ended June 28, 2025 and June 29, 2024 were $0.5 million and $0.6 million, respectively. As of June 28, 2025, the weighted-average number of years until the next renewal was two years for patents and six years for trademarks.

Indefinite-lived intangible assets are subject to annual impairment testing, unless circumstances dictate more frequent testing, if impairment indicators exist. For goodwill, the Company performs a qualitative assessment during the fourth quarter each year, for its annual impairment analysis. In the fourth quarter of 2024, the Company performed its annual impairment analysis, and concluded that it was more likely than not that the fair value of the healthcare reporting unit was greater than its carrying value. Accordingly, no further testing was required on this reporting unit.