Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Oct. 31, 2017	Nov. 30, 2016	Aug. 31, 2016	Mar. 31, 2017	Dec. 31, 2017
Goodwill [Line Items]
Acquisitions					$ 145.3
Packaging
Goodwill [Line Items]
Acquisitions					145.3
TimBar Corporation
Goodwill [Line Items]
Decrease to goodwill				$ 384.5
TimBar Corporation \| Packaging
Goodwill [Line Items]
Acquisitions			$ 157.3
Columbus Container Inc \| Packaging
Goodwill [Line Items]
Acquisitions		$ 36.6
Sacramento Container Corporation \| Packaging
Goodwill [Line Items]
Acquisitions	$ 151.1
TimBar and Columbus Container \| Packaging
Goodwill [Line Items]
Decrease to goodwill					$ 5.8