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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 1,584.0 | $ 1,417.4 | $ 3,120.5 | $ 2,818.4
Operating income (loss) | 233.8 | 200.2 | 436.9 | 381.0
Interest expense, net | (25.2) | (22.5) | (49.2) | (44.1)
Income before taxes | 208.6 | 177.7 | 387.7 | 336.9
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (37.1) | (34.7) | (70.9) | (72.4)
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (37.1) | (34.7) | (70.9) | (72.4)
Packaging |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,305.5 | 1,123.6 | 2,556.8 | 2,217.4
Operating income (loss) | 224.5 | 192.4 | 415.3 | 353.9
Packaging | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 6.0 | 1.7 | 11.6 | 3.4
Packaging | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,311.5 | 1,125.3 | 2,568.4 | 2,220.8
Paper |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 253.7 | 266.8 | 512.9 | 547.3
Operating income (loss) | 29.1 | 24.4 | 58.9 | 60.5
Paper | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 253.7 | 266.8 | 512.9 | 547.3
Corporate and Other Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 24.8 | 27.0 | 50.8 | 53.7
Operating income (loss) | (19.8) | (16.6) | (37.3) | (33.4)
Corporate and Other Segment | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 31.1 | 33.0 | 59.3 | 69.0
Corporate and Other Segment | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 55.9 | $ 60.0 | $ 110.1 | $ 122.7

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