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Goodwill and Acquired Intangible Assets
6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets
Note 5 - Goodwill and Acquired Intangible Assets
Intangible assets, other than goodwill, consisted of the following as of June 30, 2024 and December 31, 2023, respectively:
(in millions)Gross Carrying AmountAccumulated AmortizationNetWeighted Average Amortization Period in Years
Intangible assets subject to amortization:
Customer relationships$288.1 $(122.8)$165.3 14.5
Acquired technology331.3 (227.5)103.8 6.3
Brand portfolio11.5 (7.9)3.6 7.8
Total intangible assets subject to amortization$630.9 $(358.2)$272.7 
Intangible assets not subject to amortization
Pre-Acquisition ZI brand portfolio$33.0 $— $33.0 
Total intangible assets not subject to amortization$33.0 $— $33.0 
Total intangible assets$663.9 $(358.2)$305.7 
(in millions)Gross Carrying AmountAccumulated AmortizationNetWeighted Average Amortization Period in Years
Intangible assets subject to amortization:
Customer relationships$287.6 $(112.5)$175.1 14.5
Acquired technology330.8 (208.4)122.4 6.3
Brand portfolio11.5 (7.4)4.1 7.9
Total intangible assets subject to amortization
$629.9 $(328.3)$301.6 
Intangible assets not subject to amortization:
Pre-Acquisition ZI brand portfolio$33.0 $— $33.0 
Total intangible assets not subject to amortization
$33.0 $— $33.0 
Total intangible assets$662.9 $(328.3)$334.6 
Amortization expense was $15.1 million and $15.0 million for the three months ended June 30, 2024 and 2023, respectively. Amortization expense was $29.9 million and $31.1 million for the six months ended June 30, 2024 and 2023, respectively.
Goodwill was $1,692.7 million as of June 30, 2024 and December 31, 2023.
There were no events or circumstances indicating that goodwill might be impaired as of June 30, 2024.