Transactions With Related Parties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 8,177.6		$ 8,177.6		$ 8,003.8
Revenue from Contract with Customer, Excluding Assessed Tax, Total	1,936.0	$ 2,125.9	$ 5,864.5	$ 6,499.6
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	20.3	23.1	$ 61.5	67.4
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs
Related Party Transaction [Line Items]
Fiber costs from related parties	2.9	$ 3.4	$ 8.9	$ 10.7
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	$ 3.6		$ 3.6		$ 2.2