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Receivables, net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Receivables, Net, Current [Abstract]          
Trade accounts receivable $ 150.3   $ 150.3   $ 85.2
Accounts Receivable, Allowance for Credit Loss, Current (1.5)   (1.5)   (1.2)
Unbilled Receivables, Current 5.0   5.0   4.1
Income Taxes Receivable, Current 12.4   12.4   4.8
Other Receivables, Net, Current 6.6   6.6   3.1
Receivables, Net 172.7   172.7   $ 96.1
Disaggregation of Revenue [Line Items]          
Net Sales 393.3 $ 278.9 996.5 $ 867.4  
Paperboard [Member]          
Disaggregation of Revenue [Line Items]          
Net Sales 374.5 253.8 946.5 789.7  
Pulp          
Disaggregation of Revenue [Line Items]          
Net Sales 12.4 21.2 36.2 64.5  
Other          
Disaggregation of Revenue [Line Items]          
Net Sales $ 6.3 $ 4.0 $ 13.8 $ 13.3