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Transactions with WestRock and related-parties - Summary of Condensed Consolidated Statements of Operations (Details) - Affiliated Entity - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Operating Income (Loss) |  |  |  |
Total allocated cost | $ 0.0 | $ 7.0 | $ 0.0 | $ 19.4
Cost of sales |  |  |  |
Operating Income (Loss) |  |  |  |
Total allocated cost | 0.0 | 1.4 | 0.0 | 5.7
Selling, general and administrative expenses |  |  |  |
Operating Income (Loss) |  |  |  |
Total allocated cost | 0.0 | 2.2 | 0.0 | 6.5
Interest expense, net |  |  |  |
Operating Income (Loss) |  |  |  |
Total allocated cost | $ 0.0 | $ 3.4 | $ 0.0 | $ 7.2

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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