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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 05, 2018
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Accumulated benefit obligation for plans with obligations in excess of plan assets | $ 1,100.0 |  |  |
Weighted-Average expected return on plan assets for 2019 | 6.06% |  |  |
Pension Contributions [Abstract] |  |  |  |
Expected contribution to qualified plans (at least) | $ 15.8 |  |  |
Company's common stock | 1.9 | 1.8 |  |
Deferred compensation liability | $ 14.2 | $ 13.6 |  |
Minimum |  |  |  |
Pension Contributions [Abstract] |  |  |  |
Company's contribution to pension plan, percentage | 3.00% |  |  |
Maximum |  |  |  |
Pension Contributions [Abstract] |  |  |  |
Company's contribution to pension plan, percentage | 5.00% |  |  |
Pension Plans |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Weighted-Average expected return on plan assets for 2019 | 6.06% | 6.55% | 6.57% |
Fair value of plan assets | $ 873.2 | $ 954.8 | $ 830.4 |
Pension Contributions [Abstract] |  |  |  |
Contributions to pension plan | 22.9 | 43.5 |  |
Pension Plans | Qualified |  |  |  |
Pension Contributions [Abstract] |  |  |  |
Contributions to pension plan | 21.8 | 42.1 | 57.1 |
Matching Contributions |  |  |  |
Pension Contributions [Abstract] |  |  |  |
Company's contribution to defined contribution plans | 45.6 | 42.8 | 40.4 |
Service Related Contributions |  |  |  |
Pension Contributions [Abstract] |  |  |  |
Company's contribution to defined contribution plans | $ 24.5 | $ 22.4 | $ 14.9 |
Fixed Income Securities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Percentage of Fair Value | 53.00% | 21.00% |  | 52.00%
Other Securities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Percentage of Fair Value | 2.00% | 64.00% |  |
Boise Inc. |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Fair value of plan assets | $ 488.9 |  |  |
Boise Inc. | Equities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Target Allocation | 44.00% |  |  |
Boise Inc. | Fixed Income Securities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Target Allocation | 54.00% |  |  |
Boise Inc. | Other Securities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Target Allocation | 2.00% |  |  |
Packaging Corporation of America |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Fair value of plan assets | $ 384.3 |  |  |
Packaging Corporation of America | Equities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Target Allocation | 50.00% |  |  |
Packaging Corporation of America | Fixed Income Securities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Target Allocation | 49.00% |  |  |
Packaging Corporation of America | Other Securities |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Target Allocation | 1.00% |  |  |
Other(Cash) | Boise Inc. |  |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax) |  |  |  |
Percentage of Fair Value | 100.00% |  |  |

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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