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Segment Information - Analysis of Operations by Reportable Segment (Parenthetical) (Details) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2019

Sep. 30, 2019

^[2]

Jun. 30, 2019

Mar. 31, 2019

^[3]

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Segment Reporting Information [Line Items]

Operating Income (Loss)

$ 235.1

^[1]

$ 262.8

$ 280.4

$ 275.4

$ 286.7

^[4]

$ 298.5

^[5]

$ 269.6

^[6]

$ 212.9

^[7]

$ 1,053.7

$ 1,067.7

$ 932.5

^[8]

Non-operating pension expense

(7.9)

(2.1)

(1.3)

^[8]

Interest expense, net

(128.8)

^[9]

(95.1)

(102.6)

^[8],[10]

Income before taxes

917.0

970.5

828.6

^[8]

Acquisition and integration related costs

^[11]

0.2

0.8

Hexacomb working capital adjustment

^[12]

2.3

Write-Off of Deferred Financing Costs

Segment Reporting Information [Line Items]

Interest expense, net

(1.8)

Corrugated Products Facility Closure

Segment Reporting Information [Line Items]

Restructuring charges

0.3

0.5

Debt Refinancing

Segment Reporting Information [Line Items]

Restructuring charges

$ 38.7

38.7

DeRidder, Louisiana Mill

Segment Reporting Information [Line Items]

Charges for disposal of fixed assets

3.0

Wallula, Washington Mill

Segment Reporting Information [Line Items]

Restructuring charges

3.6

$ 4.0

$ 13.6

$ 8.8

ASU 2017-07 | As Reported

Segment Reporting Information [Line Items]

Operating Income (Loss)

931.2

Interest expense, net

(102.6)

Income before taxes

828.6

ASU 2017-07 | Non-Operating Pension Adjustment

Segment Reporting Information [Line Items]

Operating Income (Loss)

1.3

Non-operating pension expense

(1.3)

Packaging

Segment Reporting Information [Line Items]

Operating Income (Loss)

963.4

^[13]

1,045.4

^[14]

950.3

^[8],[15]

Restructuring charges

0.3

1.6

Property damage and business interruption insurance

$ 0.5

0.5

Acquisition and integration related costs

0.2

1.7

Packaging | Hexacomb Europe and Mexico

Segment Reporting Information [Line Items]

Acquisition and integration related costs

1.6

Packaging | Corrugated Products Facility Closure

Segment Reporting Information [Line Items]

Operating Income (Loss)

7.2

Packaging | Timberland

Segment Reporting Information [Line Items]

Operating Income (Loss)

2.0

Packaging | DeRidder, Louisiana Mill

Segment Reporting Information [Line Items]

Charges for disposal of fixed assets

3.0

Property damage and business interruption insurance

5.0

Packaging | Wallula, Washington Mill

Segment Reporting Information [Line Items]

Restructuring charges

0.8

12.3

Packaging | ASU 2017-07 | As Reported

Segment Reporting Information [Line Items]

Operating Income (Loss)

943.7

Packaging | ASU 2017-07 | Non-Operating Pension Adjustment

Segment Reporting Information [Line Items]

Operating Income (Loss)

6.6

Paper

Segment Reporting Information [Line Items]

Operating Income (Loss)

175.4

^[16]

97.7

^[17]

54.0

^[8],[18]

Facilities closure costs

0.4

Paper | Wallula, Washington Mill

Segment Reporting Information [Line Items]

Restructuring charges

0.2

17.7

33.4

Paper | ASU 2017-07 | As Reported

Segment Reporting Information [Line Items]

Operating Income (Loss)

61.5

Paper | ASU 2017-07 | Non-Operating Pension Adjustment

Segment Reporting Information [Line Items]

Operating Income (Loss)

(7.5)

Corporate and Other

Segment Reporting Information [Line Items]

Operating Income (Loss)

$ (85.1)

(75.4)

^[19]

(71.8)

^[8],[20]

Restructuring charges

$ 0.2

Facilities closure costs

1.0

Corporate and Other | Hexacomb Europe and Mexico

Segment Reporting Information [Line Items]

Hexacomb working capital adjustment

0.7

Corporate and Other | ASU 2017-07 | As Reported

Segment Reporting Information [Line Items]

Operating Income (Loss)

(74.0)

Corporate and Other | ASU 2017-07 | Non-Operating Pension Adjustment

Segment Reporting Information [Line Items]

Operating Income (Loss)

$ 2.2

[1]	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).
[2]	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).
[3]	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).
[4]	Includes $3.6 million of charges 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 ($2.7 million after-tax or $0.03 per diluted share) and $0.1 million of charges for acquisition and integration costs related to recent acquisitions ($0.1 million after-tax or $0.00 per diluted share). Also includes $2.0 million of income tax benefit for the re-measurement of our net deferred tax liability to our 2017 measurement period adjustments in accordance with SEC Staff Accounting Bulletin No. 118 (SAB 118), Income Tax Accounting Implications of the Tax Cuts and Jobs Act ($0.02 per diluted share).
[5]	Includes $4.0 million of charges 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 ($2.9 million after-tax or $0.04 per diluted share) and $1.3 million of charges consisting of closure costs related to corrugated products facilities and a corporate administration facility ($1.0 million after-tax or $0.01 per diluted share). Also includes $0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities ($0.4 million after-tax or $0.00 per diluted share) and $0.1 million of charges for acquisition and integration costs related to recent acquisitions ($0.01 million after-tax or $0.00 per diluted share).
[6]	Includes $0.2 million of charges consisting of closure costs related to corrugated products facilities and a corporate administration facility ($0.2 million after-tax and $0.00 per diluted share) and $13.6 million of charges 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 ($10.2 million after-tax or $0.11 per diluted share).
[7]	Includes $0.3 million of charges consisting of closure costs related to corrugated products facilities and a corporate administration facility ($0.2 million after-tax or $0.00 per diluted share) and $8.8 million of charges 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 ($6.6 million after-tax or $0.07 per diluted share).
[8]	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.
[9]	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.
[10]	Includes $1.8 million of expense related to the write-off of deferred debt issuance costs in connection with the December 2017 debt refinancing.
[11]	Includes charges for acquisition and integration costs related to recent acquisitions.
[12]	Includes income related to a working capital adjustment from the April 2015 sale of our Hexacomb corrugated manufacturing operations in Europe and Mexico.
[13]	(b)     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.
[14]	(e)     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.
[15]	(h)     Includes the following: o $7.2 million of income, net, primarily related to the sale of land corresponding to the closure of a corrugated products facility, partially offset by closure costs related to corrugated products facilities, and a lump sum settlement of a multiemployer pension plan withdrawal liability for one of our corrugated products facilities. o $1.7 million of charges for acquisition and integration costs related to recent acquisitions. o $2.0 million gain related to the expiration of a repurchase option corresponding to timberland previously sold. o $1.6 million of income related to a working capital adjustment from the April 2015 sale of our Hexacomb corrugated manufacturing operations in Europe and Mexico. o $5.0 million of costs for the property damage and business interruption insurance deductible corresponding to the February 2017 explosion at our DeRidder, Louisiana mill.
[16]	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.
[17]	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.
[18]	Includes $33.4 million of charges 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 and $0.4 million of charges related to the closure costs of a paper administration facility.
[19]	Includes $0.2 million of charges consisting of closure costs related to a corporate administration facility.
[20]	Includes $1.0 million of charges related to the closure costs of a corporate administration facility and $0.7 million of income related to a working capital adjustment from the April 2015 sale of our Hexacomb corrugated manufacturing operations in Europe and Mexico.

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