Transactions With Related Parties - Additional Information (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
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 8,753.8		$ 8,753.8		$ 8,681.1
Revenue from Contract with Customer, Excluding Assessed Tax, Total	2,182.4	$ 1,936.0	$ 6,237.2	$ 5,864.5
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]
Revenue from Contract with Customer, Excluding Assessed Tax, Total	22.1	20.3	$ 63.2	61.5
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs
Related Party Transaction [Line Items]
Fiber costs from related parties	2.6	$ 2.9	$ 8.4	$ 8.9
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 assets	$ 4.5		$ 4.5
Carrying amount of LTP's liabilities					$ 3.3