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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of our goodwill were as follows (dollars in millions):
|  |  |  |  |  |  |  |  |  | Total |
|  | Packaging |  |  | Paper |  |  | Goodwill |
Balance at January 1, 2019 |  | $ | 862.1 |  |  | $ | 55.2 |  |  | $ | 917.3 |
Acquisitions (a) |  |  | 1.4 |  |  |  | — |  |  |  | 1.4 |
Balance at December 31, 2019 |  |  | 863.5 |  |  |  | 55.2 |  |  |  | 918.7 |
Impairment of Paper segment |  |  | — |  |  |  | (55.2 | ) |  |  | (55.2 | )
Balance at December 31, 2020 |  | $ | 863.5 |  |  | $ | — |  |  | $ | 863.5 |
(a) | During 2019, the Company recorded a $1.4 million adjustment to increase the goodwill balance for the Company’s October 2018 acquisition of Englander.
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, 2020 |  |  | As of December 31, 2019 |
|  | 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 (b)(c) |  |  | 9.1 |  |  | $ | 503.8 |  |  | $ | 220.2 |  |  |  | 10.0 |  |  | $ | 503.8 |  |  | $ | 180.2 |
Trademarks and trade names |  |  | 9.3 |  |  |  | 34.8 |  |  |  | 23.0 |  |  |  | 9.5 |  |  |  | 34.8 |  |  |  | 20.6 |
Other |  |  | 1.2 |  |  |  | 4.3 |  |  |  | 3.8 |  |  |  | 2.1 |  |  |  | 4.3 |  |  |  | 3.3 |
Total intangible assets (excluding goodwill) |  |  | 9.1 |  |  | $ | 542.9 |  |  | $ | 247.0 |  |  |  | 9.9 |  |  | $ | 542.9 |  |  | $ | 204.1 |
(b) | During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.
(c) | During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million.

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