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Transactions With Related Parties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 10,980.0	$ 8,753.8	$ 10,980.0	$ 8,753.8	$ 8,833.2
Net sales	2,313.4	2,182.4	$ 6,625.7	6,237.2
Boise Cascade Co-Owner of LTP
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage			50.00%
Boise Cascade Co-Owner of LTP | Fiber
Related Party Transaction [Line Items]
Net sales	21.5	22.1	$ 54.3	63.2
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs
Related Party Transaction [Line Items]
Fiber costs from related parties	2.7	$ 2.6	$ 6.7	$ 8.4
Packaging Corporation of America
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage			50.00%
Variable Interest Entity
Related Party Transaction [Line Items]
Carrying amount of LTP's liabilities	$ 4.4		$ 4.4		$ 3.1

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