Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Nov. 30, 2016
Goodwill [Line Items]
Goodwill	$ 737.9
Adjustment to increase (decrease) goodwill	(0.8)
Goodwill [Roll Forward]
Balance at January 1, 2017	737.1
Balance at March 31, 2017	737.9
Packaging
Goodwill [Line Items]
Goodwill	682.7
Goodwill [Roll Forward]
Balance at January 1, 2017	681.9
Balance at March 31, 2017	682.7
Paper
Goodwill [Line Items]
Goodwill	55.2
Goodwill [Roll Forward]
Balance at March 31, 2017	55.2
TimBar Corporation
Goodwill [Line Items]
Goodwill	157.3
Adjustment to increase (decrease) goodwill	(1.1)
Goodwill [Roll Forward]
Balance at January 1, 2017	156.2
Balance at March 31, 2017	157.3
Columbus Container Inc
Goodwill [Line Items]
Goodwill		$ 36.9
Adjustment to increase (decrease) goodwill	$ 0.3