Amount included in cost of sales related to transactions with related parties incurred and recorded in the statement of operations for the period.

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Transactions With Related Parties (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Carrying amount of LTP's assets	$ 3.8		$ 5.0
Carrying amount of LTP's liabilities	$ 3.8		$ 5.0
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	$ 23.5	$ 22.3
Fiber costs from related parties	23.5	22.3
Boise Cascade Co-Owner of LTP \| Wood Products, Including Chips and Logs
Related Party Transaction [Line Items]
Fiber costs from related parties	$ 5.0	$ 4.7
PCA
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage	50.00%