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Transactions With Related Parties - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Carrying amount of LTP's assets $ 7,673.6   $ 7,673.6   $ 7,433.2
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]          
Revenue from related parties 20.7 $ 13.8 $ 41.0 $ 36.4  
Fiber costs from related parties 20.7 13.8 41.0 36.4  
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs          
Related Party Transaction [Line Items]          
Fiber costs from related parties 3.4 $ 2.5 $ 6.7 $ 6.7  
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 assets 3.8   $ 3.8   2.5
Carrying amount of LTP's liabilities $ 3.8   $ 3.8   $ 2.5