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Inventories - Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Inventory Disclosure [Abstract]    
Inventories $ 264.6 $ 161.2
Inventory [Line Items]    
Inventory, Finished Goods, Net of Reserves 122.0 77.4
Inventory, Supplies, Net of Reserves 104.7 57.0
Inventories 264.6 161.2
Inventories    
Inventory [Line Items]    
Inventory, Raw Materials, Net of Reserves 30.5 22.1
Inventory Pulp    
Inventory [Line Items]    
Inventory, Raw Materials, Net of Reserves $ 7.5 $ 4.7