Amount of contributions made by the employer to defined benefit plans.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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Employee Benefit Plans and Other Postretirement Plans - Schedule of Pension Plan Asset Investments and Target Allocations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 57,100,000	$ 57,100,000	$ 400,000
Fair value of plan assets	$ 830,400,000	$ 764,400,000
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	54.00%	55.00%
International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	23.00%	22.00%
U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	21.00%	20.00%
Real Estate Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	1.00%	1.00%
Other Securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Fair Value	1.00%	2.00%
Packaging Corporation of America
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 328,600,000
Packaging Corporation of America \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	53.00%
Packaging Corporation of America \| Other Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	3.00%
Packaging Corporation of America \| Equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	44.00%
Boise Inc.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 501,800,000
Boise Inc. \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	55.00%
Boise Inc. \| Equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations	45.00%