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Segment Information - Segment Sales to External Customers by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | [1] | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [3] | Mar. 31, 2016 | [4] | Dec. 31, 2015 | [5] | Sep. 30, 2015 | [6] | Jun. 30, 2015 | [7] | Mar. 31, 2015 | [8] | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers | $ 1,476.6 | $ 1,484.0 | $ 1,417.4 | $ 1,401.0 | $ 1,390.9 | $ 1,470.8 | $ 1,454.3 | $ 1,425.7 | $ 5,779.0 | $ 5,741.7 | $ 5,852.6
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers |  |  |  |  |  |  |  |  | 5,779.0 | 5,741.7 | 5,852.6
Operating Segments | Packaging |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers |  |  |  |  |  |  |  |  | 4,584.8 | 4,477.3 | 4,540.3
Operating Segments | Paper |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers |  |  |  |  |  |  |  |  | 1,093.9 | 1,143.1 | 1,201.4
Operating Segments | Paper | White Papers |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers |  |  |  |  |  |  |  |  | 1,065.8 | 1,089.6 | 1,138.5
Operating Segments | Paper | Market Pulp |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers |  |  |  |  |  |  |  |  | 28.1 | 53.5 | 62.9
Operating Segments | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment sales to external customers |  |  |  |  |  |  |  |  | $ 100.3 | $ 121.3 | $ 110.9
[1] | Includes $4.5 million of closure costs related to a corrugated products facility and a paper products facility ($2.9 million after-tax or $0.03 per diluted share), $2.7 million of costs related to ceased production of softwood market pulp operations at our Wallula, Washington mill and the permanent shutdown of the No.1 machine ($1.8 million after-tax or $0.02 per diluted share), and $1.2 million of acquisition-related costs for TimBar Corporation and Columbus Container, Inc. acquisitions ($0.8 million after-tax or $0.01 per diluted share).
[2] | Includes $2.0 million of closure costs related to a corrugated products facility and a paper products facility ($1.4 million after-tax or $0.02 per diluted share) and $2.9 million of acquisition-related costs for TimBar Corporation and Columbus Container, Inc. acquisitions ($1.9 million after-tax or $0.02 per diluted share).
[3] | Includes $1.7 million of closure costs related to a corrugated products facility and a paper products facility ($1.0 million after-tax or $0.01 per diluted share), $0.3 million of acquisition-related costs for TimBar Corporation ($0.2 million after-tax or $0.0 per diluted share), and $0.9 million related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities ($0.6 million after-tax or $0.01 per diluted share).
[4] | Includes $2.8 million of closure costs related to a corrugated products facility and a paper products facility. ($1.9 million after-tax or $0.02 per diluted share).
[5] | Includes $3.5 million of income from DeRidder restructuring ($2.2 million after-tax or $0.02 per diluted share) and $3.8 million of integration-related and other costs ($2.6 million after-tax or $0.03 per diluted share).
[6] | Includes $3.8 million of income from DeRidder restructuring ($2.3 million after-tax or $0.02 per diluted share) and $2.4 million of integration-related and other costs ($1.7 million after-tax or $0.02 per diluted share). Also includes $6.7 million gain from the sale of our paper mill site at St. Helens, Oregon ($4.4 million after tax or $0.05 per diluted share).
[7] | Includes $1.0 million of income from DeRidder restructuring ($0.7 million after-tax or $0.01 per diluted share) and $3.7 million of integration-related and other costs ($2.3 million after-tax or $0.03 per diluted share).
[8] | Includes $10.3 million of DeRidder restructuring charges ($6.6 million after-tax or $0.07 per diluted share) and $3.5 million of integration-related and other costs ($2.2 million after-tax or $0.02 per diluted share). Also includes a $3.6 million tax credit from the State of Louisiana related to our capital investment and the jobs retained at the DeRidder, Louisiana mill.

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