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Inventories - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Paperboard and tissue products $ 154.9 $ 148.0
Materials and supplies 105.6 100.1
Inventories 287.7 277.7
Inventory [Line Items]    
Paperboard and tissue products 154.9 148.0
Materials and supplies 105.6 100.1
Inventories 287.7 277.7
Raw Materials    
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Gross 13.0 13.7
Inventory [Line Items]    
Inventory, Raw Materials, Gross 13.0 13.7
Inventory Pulp    
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Gross 14.2 15.9
Inventory [Line Items]    
Inventory, Raw Materials, Gross $ 14.2 $ 15.9