Note 5 - Goodwill and Acquired Intangible Assets Intangible assets, other than goodwill, consisted of the following as of September 30, 2024 and December 31, 2023, respectively: | | | | | | | | | | | | | | | | | | | | | | | | (in millions) | Gross Carrying Amount | | Accumulated Amortization | | Net | | Weighted Average Amortization Period in Years | Intangible assets subject to amortization: | | | | | | | | Customer relationships | $ | 288.1 | | | $ | (127.9) | | | $ | 160.2 | | | 14.5 | Acquired technology | 331.3 | | | (237.1) | | | 94.2 | | | 6.3 | Brand portfolio | 11.5 | | | (8.1) | | | 3.4 | | | 7.8 | Total intangible assets subject to amortization | $ | 630.9 | | | $ | (373.1) | | | $ | 257.8 | | | | | | | | | | | | 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 | | | $ | (373.1) | | | $ | 290.8 | | | |
| | | | | | | | | | | | | | | | | | | | | | | | (in millions) | Gross Carrying Amount | | Accumulated Amortization | | Net | | Weighted Average Amortization Period in Years | Intangible assets subject to amortization: | | | | | | | | Customer relationships | $ | 287.6 | | | $ | (112.5) | | | $ | 175.1 | | | 14.5 | Acquired technology | 330.8 | | | (208.4) | | | 122.4 | | | 6.3 | Brand portfolio | 11.5 | | | (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 $15.0 million and $14.9 million for the three months ended September 30, 2024 and 2023, respectively. Amortization expense was $44.9 million and $46.0 million for the nine months ended September 30, 2024 and 2023, respectively. Goodwill was $1,692.7 million as of September 30, 2024 and December 31, 2023. There were no events or circumstances indicating that goodwill might be impaired as of September 30, 2024.
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