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Goodwill and Acquired Intangible Assets | 9 Months Ended
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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 Amount |  | Accumulated Amortization |  | Net |  | Weighted Average Amortization Period in Years
Intangible assets subject to amortization: |  |  |  |  |  |  |
Customer relationships | $ | 287.6 |  |  | $ | (87.0) |  |  | $ | 200.6 |  |  | 14.4
Acquired technology | 330.8 |  |  | (157.0) |  |  | 173.8 |  |  | 6.3
Brand portfolio | 11.5 |  |  | (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 acquisitions | 123.0 |
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.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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