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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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