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v3.20.4

Transactions With Related Parties - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Carrying amount of LTP's assets | $ 7,433.2 | $ 7,235.8 | $ 6,569.7
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 | $ 70.6 | 81.7 | 83.1
Fiber costs from related parties | 70.6 | 81.7 | 83.1
Boise Cascade Co-Owner of LTP | Wood Products, Including Chips and Logs |  |  |
Related Party Transaction [Line Items] |  |  |
Fiber costs from related parties | $ 12.6 | 16.8 | $ 16.8
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 | 3.9 |
Carrying amount of LTP's liabilities | $ 2.5 | $ 3.9 |

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