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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets |
8. | Goodwill and Other Intangible Assets
The changes in the net carrying value of goodwill by reportable segment for the years ended December 31, 2023 and 2022 are as follows:
| Sealing Technologies |  | Advanced Surface Technologies |  | Total
| (in millions)
Goodwill as of December 31, 2021 | $ | 279.4 |  |  | $ | 668.6 |  |  | $ | 948.0 |
Foreign currency translation | (2.6) |  |  | (10.9) |  |  | (13.5) |
Acquisition | — |  |  | 0.5 |  |  | 0.5 |
Disposition | (6.0) |  |  | — |  |  | (6.0) |
Impairment | — |  |  | (65.2) |  |  | (65.2) |
Goodwill as of December 31, 2022 | 270.8 |  |  | 593.0 |  |  | 863.8 |
Foreign currency translation | 5.4 |  |  | — |  |  | 5.4 |
Impairment | — |  |  | (60.8) |  |  | $ | (60.8) |
Goodwill as of December 31, 2023 | $ | 276.2 |  |  | $ | 532.2 |  |  | $ | 808.4 |
The goodwill balances reflected above are net of accumulated impairment losses of $27.8 million for the Sealing Technologies segment as of December 31, 2023, 2022 and 2021 and $126.0 million and $65.2 million for the Advanced Surface Technologies segment as of December 31, 2023 and 2022, respectively. Identifiable intangible assets are as follows:
| As of December 31, 2023 |  | As of December 31, 2022
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
| (in millions)
Amortized: |  |  |  |  |  |  |
Customer relationships | $ | 486.6 |  |  | $ | 184.8 |  |  | $ | 484.5 |  |  | $ | 157.6 |
Existing technology | 465.2 |  |  | 106.1 |  |  | 463.7 |  |  | 71.3 |
Trademarks | 64.9 |  |  | 29.6 |  |  | 64.8 |  |  | 24.0 |
Other | 27.4 |  |  | 20.9 |  |  | 36.4 |  |  | 27.3 |
| 1,044.1 |  |  | 341.4 |  |  | 1,049.4 |  |  | 280.2 |
Indefinite-Lived: |  |  |  |  |  |  |
Trademarks | 30.8 |  |  | — |  |  | 30.6 |  |  | — |
Total | $ | 1,074.9 |  |  | $ | 341.4 |  |  | $ | 1,080.0 |  |  | $ | 280.2 |
Amortization expense for the years ended December 31, 2023, 2022 and 2021 was $69.3 million, $76.8 million and $44.3 million, respectively. The estimated amortization expense for definite-lived (amortized) intangible assets for the next five years is as follows (in millions):
2024 | $ | 69.1 |
2025 | $ | 68.1 |
2026 | $ | 64.5 |
2027 | $ | 64.0 |
2028 | $ | 63.4 |

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