Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Nov. 30, 2016	Aug. 29, 2016	Dec. 31, 2013
Goodwill [Line Items]
Goodwill		$ 544,000,000	$ 544,000,000			$ 546,800,000
Goodwill [Roll Forward]
Beginning Balance		544,000,000
Sale of Hexacomb Europe and Mexico	[1]		2,800,000
Acquisitions	[1]	193,900,000
Ending Balance		737,900,000	544,000,000
Packaging
Goodwill [Line Items]
Goodwill		488,800,000	488,800,000			491,600,000
Goodwill [Roll Forward]
Beginning Balance		488,800,000
Sale of Hexacomb Europe and Mexico	[1]		2,800,000
Acquisitions	[1]	193,900,000
Ending Balance		682,700,000	488,800,000
Paper
Goodwill [Line Items]
Goodwill		55,200,000	55,200,000			$ 55,200,000
Goodwill [Roll Forward]
Beginning Balance		55,200,000
Sale of Hexacomb Europe and Mexico	[1]		0
Acquisitions	[1]	0
Ending Balance		55,200,000	55,200,000
TimBar Corporation
Goodwill [Line Items]
Goodwill		157,300			$ 148,100
Goodwill [Roll Forward]
Ending Balance		157,300
TimBar Corporation | Packaging
Goodwill [Roll Forward]
Acquisitions	[1]	157,300,000
Columbus Container Inc
Goodwill [Line Items]
Goodwill				$ 36,600,000
Columbus Container Inc | Packaging
Goodwill [Roll Forward]
Acquisitions	[1]	36,600,000
Hexacomb Europe and Mexico | Packaging
Goodwill [Roll Forward]
Sale of Hexacomb Europe and Mexico			$ 2,800,000
Proceeds from sale of business		$ 23,000,000

[1] During 2015, we sold the assets of Hexacomb Europe and Mexico, a corrugated products manufacturer, for $23.0 million and reduced goodwill in our Packaging segment by $2.8 million.