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Segment Information - Analysis of Operations by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | [2] | Jun. 30, 2020 | [3] | Mar. 31, 2020 | [4] | Dec. 31, 2019 | Sep. 30, 2019 | [6] | Jun. 30, 2019 | Mar. 31, 2019 | [7] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 1,714.2 | [1] | $ 1,693.7 | $ 1,541.6 | $ 1,708.7 | $ 1,720.0 | [5] | $ 1,750.7 | $ 1,759.9 | $ 1,733.7 | $ 6,658.2 |  | $ 6,964.3 |  | $ 7,014.6 |
Operating Income (Loss) |  | 189.3 | [1] | $ 209.5 | $ 116.1 | $ 209.1 | 235.1 | [5] | $ 262.8 | $ 280.4 | $ 275.4 | 723.9 |  | 1,053.7 |  | 1,067.7 |
Non-operating pension income and expense |  |  |  |  |  |  |  |  |  |  |  | 2.3 |  | (7.9) |  | (2.1) |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  | (93.5) |  | (128.8) | [8] | (95.1) |
Income before taxes |  |  |  |  |  |  |  |  |  |  |  | 632.7 |  | 917.0 |  | 970.5 |
Depreciation, Amortization, and Depletion |  |  |  |  |  |  |  |  |  |  |  | 410.0 |  | 387.5 |  | 410.9 |
Capital Expenditures | [9] |  |  |  |  |  |  |  |  |  |  | 421.2 |  | 399.5 |  | 551.4 |
Assets |  | 7,433.2 |  |  |  |  | 7,235.8 |  |  |  |  | 7,433.2 |  | 7,235.8 |  | 6,569.7 |
Trade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 6,658.2 |  | 6,964.3 |  | 7,014.6 |
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | (149.2) |  | (160.2) |  | (155.6) |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 6,658.2 |  | 6,964.3 |  | 7,014.6 |
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | (149.2) |  | (160.2) |  | (155.6) |
Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 5,919.5 |  | 5,932.2 |  | 5,938.5 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 829.5 | [10] | 963.4 | [11] | 1,045.4 | [12]
Depreciation, Amortization, and Depletion |  |  |  |  |  |  |  |  |  |  |  | 365.2 |  | 342.8 |  | 342.0 |
Capital Expenditures | [9] |  |  |  |  |  |  |  |  |  |  | 394.8 |  | 367.4 |  | 504.0 |
Assets |  | 5,744.0 |  |  |  |  | 5,491.5 |  |  |  |  | 5,744.0 |  | 5,491.5 |  | 5,347.0 |
Packaging | Trade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 5,901.7 |  | 5,905.1 |  | 5,912.3 |
Packaging | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 17.8 |  | 27.1 |  | 26.2 |
Packaging | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 5,919.5 |  | 5,932.2 |  | 5,938.5 |
Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 674.8 |  | 964.3 |  | 1,002.0 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | (20.0) | [13],[14] | 175.4 | [15] | 97.7 | [16]
Depreciation, Amortization, and Depletion |  |  |  |  |  |  |  |  |  |  |  | 36.5 |  | 37.7 |  | 62.0 |
Capital Expenditures | [9] |  |  |  |  |  |  |  |  |  |  | 20.1 |  | 23.8 |  | 12.6 |
Assets |  | 497.2 |  |  |  |  | 791.4 |  |  |  |  | 497.2 |  | 791.4 |  | 760.1 |
Paper | Trade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 674.7 |  | 964.3 |  | 1,002.0 |
Paper | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  |  |  |
Paper | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 674.8 |  | 964.3 |  | 1,002.0 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 63.9 |  | 67.8 |  | 74.1 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | (85.6) |  | (85.1) |  | (75.4) | [17]
Depreciation, Amortization, and Depletion |  |  |  |  |  |  |  |  |  |  |  | 8.3 |  | 7.0 |  | 6.9 |
Capital Expenditures | [9] |  |  |  |  |  |  |  |  |  |  | 6.3 |  | 8.3 |  | 34.8 |
Assets |  | $ 1,192.0 |  |  |  |  | $ 952.9 |  |  |  |  | 1,192.0 |  | 952.9 |  | 462.6 |
Corporate and Other | Trade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 81.8 |  | 94.9 |  | 100.3 |
Corporate and Other | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 131.3 |  | 133.1 |  | 129.4 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | $ 213.1 |  | $ 228.0 |  | $ 229.7 |
[1] | Includes $4.0 million of charges consisting of restructuring costs for paper administrative functions and closure costs related to corrugated products facilities ($3.0 million after-tax or $0.03 per diluted share).
[2] | Includes $10.0 million of charges related to the impact of Hurricane Laura on our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses ($7.6 million after-tax or $0.08 per diluted share) and $3.3 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020 ($2.5 million after-tax or $0.03 per diluted share).
[3] | Includes $20.4 million of charges consisting of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility ($15.3 million after-tax or $0.16 per diluted share) and $6.1 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($4.6 million after-tax or $0.05 per diluted share). Also includes a non-cash goodwill impairment charge of $55.2 million as a result of the interim quantitative impairment analysis performed on our Paper reporting unit ($55.2 million after-tax or $0.58 per diluted share).
[4] | Includes $0.8 million of incremental, out-of-pocket costs related to COVID-19, including supplies, cleaning and sick pay ($0.6 million after-tax or $0.01 per diluted share) and $0.4 million of charges consisting of closure costs related to corrugated products facilities ($0.3 million after-tax or $0.00 per diluted share).
[5] | Includes $0.4 million of charges consisting of closure costs related related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.3 million after-tax or $0.00 per diluted share) and $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs as well as $3.2 million of income tax benefit from the stranded tax effects in Accumulated Other Comprehensive Income related to the write-offs of the treasury locks ($25.9 million after-tax or $0.28 per diluted share). Also includes $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility ($0.2 million after-tax or $0.00 per diluted share).
[6] | Includes $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill ($2.3 million after-tax or $0.02 per diluted share).
[7] | Includes $0.6 million of charges consisting of closure costs related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard ($0.5 million after-tax or $0.01 per diluted share).
[8] | Includes $38.7 million of charges related to the Company’s November 2019 debt refinancing, which included redemption premiums and the write-offs of remaining balances of treasury locks and unamortized debt issuance costs.
[9] | Includes “Additions to property, plant, and equipment” and excludes cash used for “Acquisitions of businesses, net of cash acquired” as reported on our Consolidated Statements of Cash Flows.
[10] | (a) Includes the following:
| o | $27.3 million of closure costs related to corrugated products facilities, substantially all of which relates to the previously announced closure of the San Lorenzo, California facility during the second quarter of 2020, partially offset by income related to the sale of a corrugated products facility during the second quarter of 2020.
| o | $10.0 million of charges related to the impact of Hurricane Laura at our DeRidder, Louisiana mill, including unabsorbed costs related to lost production, excess purchased containerboard and freight costs, repair expenses, rental and supplies costs, and other recovery expenses.
| o | $6.3 million of incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.
[11] | (d) Includes the following:
| o | $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.
| o | $0.8 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.
| o | $0.3 million of charges consisting of closure costs related to corrugated products facilities, partially offset by income from the sale of a building related to a closed corrugated products facility.
[12] | (g) Includes the following:
| o | $12.3 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.
| o | $1.6 million of charges consisting of closure costs related to corrugated products facilities.
| o | $0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities.
| o | $0.2 million of charges for acquisition and integration costs related to recent acquisitions.
[13] | (b) Includes the following:
| o | $0.8 million of restructuring costs for paper administrative functions.
| o | $0.6 million incremental, out-of-pocket costs related to COVID-19 that were incurred in the first half of 2020. Costs include materials, cleaning supplies, and sick pay as well as expenses for establishing processes and logistics for the new work requirements in all of our facilities for mitigating the spread of the virus within the Company. With the process now established, we anticipate any corresponding COVID-19 related expenses to be included in normalized costs through the span of the pandemic.
[14] | (c) During the second quarter of 2020, with the exacerbated deterioration in uncoated freesheet market conditions and the estimated impact on our Paper reporting unit arising from the COVID-19 pandemic, as well as projected future results of operations, we identified a triggering event indicating possible impairment of goodwill within our Paper reporting unit. The Company performed an interim quantitative impairment analysis as of May 31, 2020, and, based on the evaluation performed, we determined that goodwill was fully impaired for the Paper reporting unit and recognized a non-cash impairment charge of $55.2 million.
[15] | Includes $0.2 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.
[16] | (h) Includes $17.7 million of charges related to the second quarter discontinuation of uncoated free sheet and coated one-side white paper grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to produce virgin kraft linerboard.
[17] | (i) Includes $0.2 million of charges consisting of closure costs related to a corporate administration facility.

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