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Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Amortization of Intangible Assets $ (1.6)  
Finite-Lived Intangible Assets, Accumulated Amortization 30.0 $ 28.4
Intangible Assets, Gross (Excluding Goodwill) $ 34.9 34.9
Maximum    
Goodwill [Line Items]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Pulp And Paperboard [Member]    
Goodwill [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 47.3 35.1
Goodwill, Acquired During Period 12.3  
Amortization of Intangible Assets (1.6)  
Intangible Assets, Net (Excluding Goodwill) 4.8 $ 6.4
Customer Relationships    
Goodwill [Line Items]    
Intangible Assets, Net (Excluding Goodwill) $ 4.8