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Acquisitions Additional Information (Details) $ in Millions			3 Months Ended		9 Months Ended
	Nov. 30, 2016 USD ($) facility	Aug. 29, 2016 USD ($) facility	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Cash purchase price						$ 385.6
Goodwill			$ 732.1		$ 732.1		$ 737.9
TimBar Corporation
Business Acquisition [Line Items]
Number of corrugated products production facilities acquired | facility		6
Cash purchase price		$ 385.6
Debt instrument, face amount		$ 385.0
Debt instrument, term		5 years
Adjustment to increase (decrease) goodwill				$ (1.1)	(1.1)
Purchase price				$ 384.5
Acquired finite-lived intangible assets, weighted average useful life		14 years 2 months 13 days
Increase in purchase price					(1.1)
Columbus Container Inc
Business Acquisition [Line Items]
Number of corrugated products production facilities acquired | facility	1
Number of corrugated products warehousing facilities acquired | facility	5
Cash purchase price	$ 99.7
Adjustment to increase (decrease) goodwill			2.2		(4.7)
Acquired finite-lived intangible assets, weighted average useful life	14 years 1 month 7 days
Increase in purchase price			$ 2.2		$ 2.2
Minimum | TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life		2 years
Minimum | Columbus Container Inc
Business Acquisition [Line Items]
Property, plant and equipment useful life	1 year
Maximum | TimBar Corporation
Business Acquisition [Line Items]
Property, plant and equipment useful life		24 years
Maximum | Columbus Container Inc
Business Acquisition [Line Items]
Property, plant and equipment useful life	32 years

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