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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 Intangible Assets and Goodwill [Table Text Block] | Changes in the carrying amounts of goodwill and intangible assets by reportable segment were as follows:
(In millions) |  | Consumer Products |  | Pulp and Paperboard |  | Total
|  | Intangibles |  | Goodwill |  | Intangibles |  |
Balance as of December 31, 2018 |  | $ | 4.6 |  |  | $ | 35.1 |  |  | $ | 19.5 |  |  | $ | 59.2 |
Amortization |  | (4.3) |  |  | — |  |  | (2.9) |  |  | (7.2) |
Balance as of December 31, 2019 |  | 0.3 |  |  | 35.1 |  |  | 16.6 |  |  | 52.0 |
Amortization |  | (0.3) |  |  | — |  |  | (2.9) |  |  | (3.2) |
Balance as of December 31, 2020 |  | $ | — |  |  | $ | 35.1 |  |  | $ | 13.7 |  |  | $ | 48.8 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | As of December 31, 2020, estimated future amortization expense related to intangible assets is as follows (in millions):
Years ending December 31, | Amount
2021 | $ | 2.9 |
2022 | 2.2 |
2023 | 2.1 |
2024 | 2.1 |
2025 | 2.1 |
Thereafter | 2.1 |
Total | $ | 13.7 |

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