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Intangible Assets, Goodwill and Other (Tables)
6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Goodwill
Pulp and Paperboard
GoodwillIntangiblesTotal
Balance as of December 31, 2023
35.1 6.4 41.5 
Recognized goodwill13.7 — 13.7 
  Amortization— (1.1)(1.1)
Balance as of June 30, 2024
$48.8 $5.4 $54.1