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Inventories - Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory [Line Items]    
Logs, chips and sawdust $ 13.9 $ 17.2
Pulp 11.7 11.5
Paperboard and tissue products 162.7 137.0
Materials and supplies 98.1 97.7
Inventories $ 286.4 $ 263.3