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Transactions with WestRock and related-parties - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016 | May 16, 2016 | May 15, 2016
Related Party Transaction |  |  |  |  |  |
Accounts payable |  |  | $ 75.9 | $ 79.2 |  |
Minimum |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
CTO Requirement |  |  |  |  | 45.00% |
Maximum |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
CTO Requirement |  |  |  |  | 55.00% |
WestRock |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Accounts payable |  |  |  |  |  | $ 16.5
WestRock | Purchase of Raw Material |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Purchases from related party | $ 7.5 | $ 20.1 |  |  |  |

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