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Goodwill and Acquired Intangible Assets
9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets
Note 7 - Goodwill and Acquired Intangible Assets
Intangible assets consisted of the following as of September 30, 2022:
(in millions)Gross Carrying AmountAccumulated AmortizationNetWeighted Average Amortization Period in Years
Intangible assets subject to amortization:
Customer relationships$287.6 $(87.0)$200.6 14.4
Acquired technology330.8 (157.0)173.8 6.3
Brand portfolio11.5 (5.4)6.1 7.5
Net intangible assets subject to amortization$629.9 $(249.4)$380.5 
Intangible assets not subject to amortization
Pre-Acquisition ZI brand portfolio$33.0 $— $33.0 
Goodwill$1,696.3 $— $1,696.3 
Amortization expense was $17.9 million and $16.1 million for the three months ended September 30, 2022 and 2021, respectively. Amortization expense was $52.3 million and $39.2 million for the nine months ended September 30, 2022 and 2021, respectively.
The following summarized changes to the Company’s goodwill (in millions):
Balance at December 31, 2021$1,575.1 
Adjustments from 2021 acquisitions(1.8)
Goodwill from 2022 acquisitions123.0 
Balance at September 30, 2022$1,696.3 
Based on the results of the Company’s impairment assessment, the Company did not recognize any impairment of goodwill during the nine months ended September 30, 2022 or September 30, 2021.