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Inventories - Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Inventories $ 259.3 $ 258.0
Inventory [Line Items]    
Inventory, Finished Goods, Net of Reserves 125.4 123.4
Inventory, Supplies, Net of Reserves 104.6 102.5
Inventories 259.3 258.0
Inventories    
Inventory [Line Items]    
Inventory, Raw Materials, Net of Reserves 21.2 25.1
Inventory Pulp    
Inventory [Line Items]    
Inventory, Raw Materials, Net of Reserves $ 8.1 $ 6.9