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Goodwill and Intangible Assets (Tables)
 12 Months Ended
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 PaperboardTotal
GoodwillIntangibles
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 
20242.1 
20252.1 
20262.1 
2027— 
Total$8.6