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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
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 allocated to each segment were as follows:
| Pulp and Paperboard |  | Total
| Goodwill |  | Intangibles |  |
Balance as of December 31, 2020 | $ | 35.1 |  |  | $ | 13.7 |  |  | $ | 48.8 |
Amortization | — |  |  | (2.9) |  |  | (2.9) |
Balance as of December 31, 2021 | 35.1 |  |  | 10.8 |  |  | 45.9 |
Amortization | — |  |  | (2.2) |  |  | (2.2) |
Balance as of December 31, 2022 | $ | 35.1 |  |  | $ | 8.6 |  |  | $ | 43.6 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | As of December 31, 2022, estimated future amortization expense related to intangible assets is as follows:
| Amount
2023 | $ | 2.1 |
2024 | 2.1 |
2025 | 2.1 |
2026 | 2.1 |
2027 | — |
Total | $ | 8.6 |

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