Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

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-SubTopic 10
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
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Transactions With Related Party (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Unconsolidated variable interest entity [Member]
Related Party Transaction [Line Items]
Revenue from related party	$ 4.1	$ 3.8	$ 13.0	$ 13.3
Cost of sales from related party	$ 22.4	$ 23.9	$ 65.4	$ 66.3
LouisianaTimberProcurementCompanyLLC [Member] \| Unconsolidated variable interest entity [Member]
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage			50.00%
LouisianaTimberProcurementCompanyLLC [Member] \| Packaging Corporation of America (PCA) [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
Related Party Transaction [Line Items]
Variable interest entity, ownership percentage			50.00%