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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of our goodwill were as follows (dollars in millions):
|  | Goodwill |
Balance at January 1, 2022 |  | $ | 923.5 |
Acquisition adjustment (a) |  |  | (1.0 | )
Adjustment related to sale of corrugated assets (b) |  |  | (0.1 | )
Balance at December 31, 2022 |  |  | 922.4 |
Balance at December 31, 2023 |  | $ | 922.4 |
(a) During 2022, the Company recorded a $1.0 million adjustment to decrease the goodwill balance for the Company's December 2021 acquisition of Advance Packaging. (b) During 2022, a corrugated products facility sold part of its operations, which primarily included existing inventory. As a result, the Company recorded a $0.1 million adjustment to decrease the goodwill balance.
Components of Intangible Assets | The weighted average useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):
|  | As of December 31, 2023 |  |  | As of December 31, 2022 |
|  | Weighted Average Remaining Useful Life (in Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Weighted Average Remaining Useful Life (in Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Customer relationships (c) |  |  | 7.4 |  |  | $ | 546.0 |  |  | $ | 326.9 |  |  |  | 8.2 |  |  | $ | 546.0 |  |  | $ | 290.9 |
Trademarks and trade names (c) |  |  | 6.5 |  |  |  | 41.3 |  |  |  | 30.9 |  |  |  | 7.2 |  |  |  | 41.3 |  |  |  | 28.6 |
Other |  |  | 2.9 |  |  |  | 4.4 |  |  |  | 4.3 |  |  |  | 3.4 |  |  |  | 4.4 |  |  |  | 4.3 |
Total intangible assets (excluding goodwill) |  |  | 7.3 |  |  | $ | 591.7 |  |  | $ | 362.1 |  |  |  | 8.1 |  |  | $ | 591.7 |  |  | $ | 323.8 |
(c) During 2022, the Company made a $1.4 million net adjustment based on the final valuation received for the intangible assets associated with the December 2021 acquisition of Advance Packaging. This adjustment resulted in a revision to the original allocations for customer relationships and trade names. As of December 31, 2022, the revised allocations for customer relationships and trade names were $42.2 million and $6.5 million, respectively.

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