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Revenue - Summary of Revenues Disaggregated by Product Line (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	[1]	Sep. 30, 2018	Sep. 30, 2017	[1]
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,809.9	$ 1,640.1		$ 5,268.1	$ 4,760.6
Packaging
Disaggregation Of Revenue [Line Items]
Revenue	1,535.1	1,346.6		4,434.2	3,915.0
Paper
Disaggregation Of Revenue [Line Items]
Revenue	254.3	271.4		774.5	784.3
Corporate and Other
Disaggregation Of Revenue [Line Items]
Revenue	$ 20.5	$ 22.1		$ 59.4	$ 61.3
[1] Prior periods have not been adjusted under the modified retrospective method for Topic 606.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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