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Segment Information - Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | $ 1,759.9 | $ 1,767.5 |  | $ 3,493.6 |  | $ 3,458.1 |
Operating Income (Loss) | 280.4 | 269.6 |  | 555.8 |  | 482.5 |
Non-operating pension expense | (2.0) | (0.5) |  | 4.1 |  | 1.1 |
Interest expense, net | (22.4) | (23.8) |  | (46.4) |  | (49.6) |
Income before taxes | 256.0 | 245.3 |  | 505.3 |  | 431.8 |
Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,759.9 | 1,767.5 |  | 3,493.6 |  | 3,458.1 |
Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | (38.3) | (40.1) |  | (78.6) |  | (75.4) |
Segment Reconciling Items |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | (38.3) | (40.1) |  | (78.6) |  | (75.4) |
Packaging |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,504.6 | 1,496.2 |  | 2,982.2 |  | 2,899.1 |
Operating Income (Loss) | 263.9 | 273.2 | [1] | 513.4 | [2] | 497.9 | [1]
Packaging | Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,497.8 | 1,489.6 |  | 2,968.6 |  | 2,886.3 |
Packaging | Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 6.8 | 6.6 |  | 13.6 |  | 12.8 |
Packaging | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,504.6 | 1,496.2 |  | 2,982.2 |  | 2,899.1 |
Paper |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 237.8 | 250.8 |  | 477.5 |  | 520.2 |
Operating Income (Loss) | 38.8 | 16.2 | [1] | 84.4 | [2] | 23.5 | [1]
Paper | Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 237.8 | 250.8 |  | 477.5 |  | 520.2 |
Paper | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 237.8 | 250.8 |  | 477.5 |  | 520.2 |
Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 17.5 | 20.5 |  | 33.9 |  | 38.8 |
Operating Income (Loss) | (22.3) | (19.8) | [1] | (42.0) |  | (38.9) | [1]
Corporate and Other | Trade |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 24.3 | 27.1 |  | 47.5 |  | 51.6 |
Corporate and Other | Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 31.5 | 33.5 |  | 65.0 |  | 62.6 |
Corporate and Other | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | $ 55.8 | $ 60.6 |  | $ 112.5 |  | $ 114.2 |
[1] |
(b) | Includes the following:
| 1. | For the three and six months ended June 30, 2018, $13.6 million and $22.4 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.
| 2. | For the three and six months ended June 30, 2018, $0.2 million and $0.5 million, respectively, of charges consisting of closure costs related to corrugated products facilities and a corporate administration facility.
[2] | The six months ended June 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.

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