Receivables, net (Tables)

9 Months Ended

Sep. 30, 2024

Receivables, Net, Current [Abstract]

Disaggregation of Revenue [Table Text Block]

	Quarter Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Net Sales:
Paperboard	$	374.5	$	253.8	$	946.5	$	789.7
Pulp	12.4		21.2		36.2		64.5
Other	6.3		4.0		13.8		13.3
	$	393.3	$	278.9	$	996.5	$	867.4

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	September 30, 2024		December 31, 2023
Trade accounts receivable	$	150.3	$	85.2
Allowance for current expected credit losses	(1.5)		(1.2)
Unbilled receivables	5.0		4.1
Taxes receivable	12.4		4.8
Other	6.6		3.1
	$	172.7	$	96.1