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Inventories - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory [Line Items]    
Logs, pulpwood, chips and sawdust $ 11.8 $ 19.4
Materials and supplies 92.6 93.1
Pulp, paperboard and tissue products 130.9 168.9
Inventories $ 235.3 $ 281.4