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GOODWILL AND INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLE ASSETS | NOTE 11. GOODWILL AND INTANGIBLE ASSETS Changes in the carrying value of goodwill were as follows:
| Chlor Alkali Products and Vinyls |  | Epoxy |  | Winchester |  | Total
Goodwill | ($ in millions)
Balance at January 1, 2022(1) | $ | 1,275.6 |  |  | $ | 145.0 |  |  | $ | — |  |  | $ | 1,420.6 |
Foreign currency translation adjustment | 0.2 |  |  | 0.1 |  |  | — |  |  | 0.3 |
Balance at December 31, 2022(1) | 1,275.8 |  |  | 145.1 |  |  | — |  |  | 1,420.9 |
Goodwill acquired during the year | — |  |  | — |  |  | 2.7 |  |  | 2.7 |
Foreign currency translation adjustment | 0.3 |  |  | 0.1 |  |  | — |  |  | 0.4 |
Balance at December 31, 2023(1) | $ | 1,276.1 |  |  | $ | 145.2 |  |  | $ | 2.7 |  |  | $ | 1,424.0 |
(1) Includes cumulative goodwill impairment of $557.6 million and $142.2 million in Chlor Alkali Products and Vinyls and Epoxy, respectively. Intangible assets consisted of the following:
|  |  | December 31,
|  |  | 2023 |  | 2022
| Useful Lives |  | Gross Amount |  | Accumulated Amortization |  | Net |  | Gross Amount |  | Accumulated Amortization |  | Net
Intangible Assets |  |  | ($ in millions)
Customers, customer contracts and relationships | 10-15 Years |  | $ | 671.7 |  |  | $ | (437.5) |  |  | $ | 234.2 |  |  | $ | 669.1 |  |  | $ | (401.2) |  |  | $ | 267.9 |
Trade names | 7 Years |  | 3.6 |  |  | (0.2) |  |  | 3.4 |  |  | — |  |  | — |  |  | — |
Acquired technology | 4-7 Years |  | 94.4 |  |  | (90.4) |  |  | 4.0 |  |  | 93.1 |  |  | (88.3) |  |  | 4.8 |
Other | 10 Years |  | 4.9 |  |  | (0.7) |  |  | 4.2 |  |  | 1.8 |  |  | (0.7) |  |  | 1.1 |
Total intangible assets |  |  | $ | 774.6 |  |  | $ | (528.8) |  |  | $ | 245.8 |  |  | $ | 764.0 |  |  | $ | (490.2) |  |  | $ | 273.8 |
Amortization expense relating to intangible assets was $37.0 million, $55.3 million and $63.1 million in 2023, 2022 and 2021, respectively. Estimated amortization expense relating to intangible assets for the subsequent five-year periods are as follows:
Estimated Amortization Expense | ($ in millions)
2024 | $ | 37.6 |
2025 | 37.2 |
2026 | 35.5 |
2027 | 35.4 |
2028 | 35.2 |
During the fourth quarter of 2023, we performed our qualitative assessment of our intangible assets. Based on our qualitative impairment assessment, it is more likely than not that the fair value of our intangible assets is greater than the carrying amount as of December 31, 2023. No impairment on our intangible assets was recorded in 2023, 2022 or 2021.

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