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Inventories - Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Paperboard and tissue products $ 152.3 $ 148.0
Materials and supplies 101.0 100.1
Inventories 281.8 277.7
Inventory [Line Items]    
Paperboard and tissue products 152.3 148.0
Materials and supplies 101.0 100.1
Inventories 281.8 277.7
Raw Materials    
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Gross 13.6 13.7
Inventory [Line Items]    
Inventory, Raw Materials, Gross 13.6 13.7
Inventory Pulp    
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Gross 14.9 15.9
Inventory [Line Items]    
Inventory, Raw Materials, Gross $ 14.9 $ 15.9