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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
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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% |  |

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- Definition Amount of contributions made by the employer to defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 35 -Paragraph 123 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937487&loc=d3e36068-114959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 63 -Subparagraph B -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12551-114930 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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