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v3.21.2

Transactions With Related Parties - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Carrying amount of LTP's assets | $ 8,630.8 |  | $ 8,630.8 |  | $ 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 | 22.3 | $ 15.6 | $ 63.3 | $ 52.0 |
Fiber costs from related parties | 22.3 | 15.6 | 63.3 | 52.0 |
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Fiber costs from related parties | 3.6 | $ 2.8 | $ 10.3 | $ 9.5 |
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 | 2.5 |  | $ 2.5 |  | 2.5
Carrying amount of LTP's liabilities | $ 2.5 |  | $ 2.5 |  | $ 2.5

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