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Segment Information - Selected Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2019

Sep. 30, 2018

Sep. 30, 2019

Sep. 30, 2018

Segment Reporting Information [Line Items]

Net sales

$ 1,750.7

$ 1,809.9

$ 5,244.3

$ 5,268.1

Operating Income (Loss)

262.8

298.5

818.6

781.0

Non-operating pension expense

(1.9)

(0.5)

6.0

1.6

Interest expense, net

(21.6)

(23.9)

(68.0)

(73.4)

Income before taxes

239.3

274.1

744.6

706.0

Trade

Segment Reporting Information [Line Items]

Net sales

1,750.7

1,809.9

5,244.3

5,268.1

Intersegment Eliminations

Segment Reporting Information [Line Items]

Net sales

(41.0)

(39.1)

(119.5)

(114.4)

Segment Reconciling Items

Segment Reporting Information [Line Items]

Net sales

(41.0)

(39.1)

(119.5)

(114.4)

Packaging

Segment Reporting Information [Line Items]

Net sales

1,489.9

1,535.1

4,472.1

4,434.2

Operating Income (Loss)

235.1

^[1]

284.4

^{[2],[3],[4],[5],[6]}

748.6

^[7],[8]

782.3

^{[2],[3],[4],[5],[6]}

Packaging | Trade

Segment Reporting Information [Line Items]

Net sales

1,482.9

1,528.3

4,451.5

4,414.7

Packaging | Intersegment Eliminations

Segment Reporting Information [Line Items]

Net sales

7.0

6.8

20.6

19.5

Packaging | Operating Segments

Segment Reporting Information [Line Items]

Net sales

1,489.9

1,535.1

4,472.1

4,434.2

Paper

Segment Reporting Information [Line Items]

Net sales

242.8

254.3

720.3

774.5

Operating Income (Loss)

48.1

32.3

^{[2],[3],[4],[5],[6]}

132.5

55.7

^{[2],[3],[4],[5],[6]}

Paper | Trade

Segment Reporting Information [Line Items]

Net sales

242.8

254.3

720.3

774.5

Paper | Operating Segments

Segment Reporting Information [Line Items]

Net sales

242.8

254.3

720.3

774.5

Corporate and Other

Segment Reporting Information [Line Items]

Net sales

18.0

20.5

51.9

59.4

Operating Income (Loss)

(20.4)

(18.2)

^{[2],[3],[4],[5],[6]}

(62.5)

(57.0)

^{[2],[3],[4],[5],[6]}

Corporate and Other | Trade

Segment Reporting Information [Line Items]

Net sales

25.0

27.3

72.5

78.9

Corporate and Other | Intersegment Eliminations

Segment Reporting Information [Line Items]

Net sales

34.0

32.3

98.9

94.9

Corporate and Other | Operating Segments

Segment Reporting Information [Line Items]

Net sales

$ 59.0

$ 59.6

$ 171.4

$ 173.8

[1]	The three and nine months ended September 30, 2019 include $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.
[2]	$0.1 million of charges related to recent acquisitions.
[3]	$1.3 million and $1.8 million, respectively, of charges consisting of closure costs related to corrugated products facilities and a corporate administration facility.
[4]	$4.0 million and $26.4 million, respectively, of charges related to the second quarter 2018 discontinuation of uncoated free sheet and coated one-side grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to a high-performance 100% virgin kraft linerboard machine.
[5]	$0.5 million of costs for the property damage insurance deductible for a weather-related incident at one of the corrugated products facilities.
[6]	The three and nine months ended September 30, 2018 include the following:
[7]	The nine months ended September 30, 2019 include $0.6 million of charges related to the announced second quarter 2018 discontinuation of uncoated free sheet and coated one-side grades at the Wallula, Washington mill associated with the conversion of the No. 3 paper machine to a high-performance 100% virgin kraft linerboard machine.
[8]	The three and nine months ended September 30, 2019 include $3.0 million of charges for the disposal of fixed assets related to the containerboard mill conversion at our DeRidder, Louisiana mill.

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