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Segment Information - Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | $ 1,733.7 | $ 1,690.6 |
Operating Income (Loss) |  | 275.4 | 212.9 | [1]
Non-operating pension expense |  | (2.0) | (0.5) | [1]
Interest expense, net |  | (24.1) | (25.8) | [1]
Income before taxes |  | 249.3 | 186.6 | [1]
Trade |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 1,733.7 | 1,690.6 |
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | (40.3) | (35.3) |
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | (40.3) | (35.3) |
Packaging |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 1,477.6 | 1,402.9 |
Operating Income (Loss) | [1] | 249.6 | 224.7 | [2]
Packaging | Trade |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 1,470.8 | 1,396.6 |
Packaging | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 6.8 | 6.3 |
Packaging | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 1,477.6 | 1,402.9 |
Paper |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 239.7 | 269.4 |
Operating Income (Loss) | [1] | 45.6 | 7.2 | [2]
Paper | Trade |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 239.7 | 269.4 |
Paper | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 239.7 | 269.4 |
Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 16.4 | 18.3 |
Operating Income (Loss) |  | (19.8) | (19.0) | [1],[2]
Corporate and Other | Trade |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 23.2 | 24.6 |
Corporate and Other | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | 33.5 | 29.0 |
Corporate and Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | $ 56.7 | $ 53.6 |
[1] | Includes $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.
[2] | Includes $8.8 million 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 and $0.3 million of charges consisting of closure costs related to corrugated products facilities and a corporate administration facility.

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