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GOODWILL AND INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
Acquisitions
There were no material acquisitions in the six months ended June 30, 2024, and 2023.
Goodwill
The following table summarizes the changes in the carrying amount of goodwill (in millions):
Amount
Balance as of December 31, 2023
$348.7 
Acquisition activity— 
Translation and other(0.7)
Balance as of June 30, 2024
$348.0 
Intangible Assets
The following table summarizes the components of gross intangible assets, accumulated amortization, and net intangible assets balances as of June 30, 2024, and December 31, 2023 (in millions):
June 30, 2024December 31, 2023
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Patents and developed technology$206.3 $(185.3)$21.0 $206.3 $(178.4)$27.9 
Distribution rights and others10.7 (10.1)0.6 10.8 (9.2)1.6 
Customer relationships27.5 (20.4)7.1 32.5 (22.9)9.6 
Total intangible assets$244.5 $(215.8)$28.7 $249.6 $(210.5)$39.1 
Amortization expense related to intangible assets was $5.0 million and $5.0 million for the three months ended June 30, 2024, and 2023, respectively. Amortization expense related to intangible assets was $10.1 million and $10.0 million for the six months ended June 30, 2024, and 2023, respectively.
The estimated future amortization expense related to intangible assets as of June 30, 2024, is as follows (in millions):
Fiscal YearAmount
Remainder of 2024
$6.8 
202511.9 
20265.2 
20272.8 
20281.3 
2029 and thereafter0.7 
Total$28.7 
The preceding expected amortization expense is an estimate. Actual amounts of amortization expense may differ from estimated amounts due to additional intangible asset acquisitions, measurement-period adjustments to intangible assets, changes in foreign currency exchange rates, impairments of intangible assets, accelerated amortization of intangible assets, and other events.