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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The changes in the carrying amount of goodwill for the six months ended June 30, 2025, by reportable business segment, were as follows:

HSTFMTFSDPIDEX
Goodwill$2,276.5 $785.2 $390.6 $3,452.3 
   Accumulated goodwill impairment losses(149.8)(20.7)(30.1)(200.6)
Balance at January 1, 20252,126.7 764.5 360.5 3,251.7 
Foreign currency translation80.6 15.8 15.9 112.3 
Measurement period adjustments4.6 — — 4.6 
Balance at June 30, 2025$2,211.9 $780.3 $376.4 $3,368.6 

The following table provides the gross carrying value and accumulated amortization for each major class of intangible asset at June 30, 2025 and December 31, 2024:

 June 30, 2025December 31, 2024
 Gross
Carrying
Amount
Accumulated
Amortization
NetGross
Carrying
Amount
Accumulated
Amortization
Net
Amortized intangible assets:
Patents$2.6 $(2.1)$0.5 $2.5 $(2.0)$0.5 
Trade names210.8 (69.6)141.2 201.4 (60.0)141.4 
Customer relationships1,125.6 (336.5)789.1 1,078.8 (278.7)800.1 
Unpatented technology323.9 (86.5)237.4 325.4 (85.1)240.3 
Software15.9 (5.6)10.3 15.2 (3.6)11.6 
Total amortized intangible assets1,678.8 (500.3)1,178.5 1,623.3 (429.4)1,193.9 
Indefinite-lived intangible assets:
Banjo trade name62.1 — 62.1 62.1 — 62.1 
Akron Brass trade name28.8 — 28.8 28.8 — 28.8 
Total intangible assets$1,769.7 $(500.3)$1,269.4 $1,714.2 $(429.4)$1,284.8 
The Company assesses goodwill and indefinite-lived intangible assets for impairment annually, or more frequently if events occur or circumstances change that indicate an asset may be impaired. The Company’s policy is to assess for impairment annually as of October 31. Based on the results of the Company’s most recent annual impairment test at October 31, 2024, all reporting units and indefinite-lived intangible assets had fair values in excess of their carrying values. There have been no events or circumstances since the last assessment date that would have required an interim impairment test.
Amortization of intangible assets was $32.0 million and $63.5 million for the three and six months ended June 30, 2025, respectively, and $23.9 million and $48.5 million for the three and six months ended June 30, 2024, respectively. Based on the intangible asset balances as of June 30, 2025, expected amortization expense for the remaining six months of 2025 and for the years 2026 through 2029 is as follows:

Estimated Amortization
Remainder of 2025$64.9 
2026128.5 
2027125.0 
2028122.1 
2029112.1