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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets The changes in the net carrying value of goodwill by reportable segment for the nine months ended September 30, 2023, are as follows:
| Sealing Technologies |  | Advanced Surface Technologies |  | Total
| (in millions)
Goodwill as of December 31, 2022 | $ | 270.8 |  |  | $ | 593.0 |  |  | $ | 863.8 |
Impairment | — |  |  | (60.8) |  |  | (60.8) |
Foreign currency translation | 2.2 |  |  | — |  |  | 2.2 |
Goodwill as of September 30, 2023 | $ | 273.0 |  |  | $ | 532.2 |  |  | $ | 805.2 |
The goodwill balances reflected above at September 30, 2023, are net of accumulated impairment losses of $27.8 million for the Sealing Technologies segment and $126.0 million for the Advanced Surface Technologies segment. Identifiable intangible assets are as follows:
| September 30, 2023 |  | December 31, 2022
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
| (in millions)
Amortized: |  |  |  |  |  |  |
Customer relationships | $ | 485.2 |  |  | $ | 177.4 |  |  | $ | 484.5 |  |  | $ | 157.6 |
Existing technology | 464.7 |  |  | 97.3 |  |  | 463.7 |  |  | 71.3 |
Trademarks | 64.6 |  |  | 27.9 |  |  | 64.8 |  |  | 24.0 |
Other | 27.6 |  |  | 20.7 |  |  | 36.4 |  |  | 27.3 |
| 1,042.1 |  |  | 323.3 |  |  | 1,049.4 |  |  | 280.2 |
Indefinite-Lived: |  |  |  |  |  |  |
Trademarks | 30.8 |  |  | — |  |  | 30.6 |  |  | — |
Total | $ | 1,072.9 |  |  | $ | 323.3 |  |  | $ | 1,080.0 |  |  | $ | 280.2 |
Amortization for the quarters and nine months ended September 30, 2023 and 2022 were $17.4 million, $19.2 million, $52.1 million, and $57.9 million, respectively.

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