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Summary of Significant Accounting Policies (Inventories) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Inventory, Finished Goods, Gross $ 123.4 $ 77.4
Other Inventory, Supplies, Gross 102.5 57.0
Inventories, net 258.0 161.2
Raw Materials    
Accounting Policies [Abstract]    
Inventory, Raw Materials, Gross 25.1 22.1
Inventory [Line Items]    
Inventory, Raw Materials, Gross 25.1 22.1
Inventory Pulp [Member]    
Accounting Policies [Abstract]    
Inventory, Raw Materials, Gross 6.9 4.7
Inventory [Line Items]    
Inventory, Raw Materials, Gross $ 6.9 $ 4.7