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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Beginning Balance	$ 737.9	$ 544.0
Acquisitions	145.3
Ending Balance	883.2	737.9
Columbus Container Inc And TimBar Corporation
Goodwill [Line Items]
Acquisitions		193.9
Packaging
Goodwill [Line Items]
Beginning Balance	682.7	488.8
Acquisitions	145.3
Ending Balance	828.0	682.7
Packaging | Columbus Container Inc And TimBar Corporation
Goodwill [Line Items]
Acquisitions		193.9
Paper
Goodwill [Line Items]
Beginning Balance	55.2	55.2
Ending Balance	$ 55.2	$ 55.2

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- Definition

Goodwill revised during period.

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

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