Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Details) - Sacramento Container Corporation - USD ($) $ in Millions	Dec. 31, 2017	Oct. 31, 2017
Finite Lived Intangible Assets [Line Items]
Other intangible assets	$ 72.6
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Other intangible assets		$ 68.4
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Other intangible assets		4.1
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Other intangible assets		$ 0.1