Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Oct. 31, 2018	Dec. 31, 2017	Oct. 31, 2017
Sacramento Container Corporation
Finite Lived Intangible Assets [Line Items]
Other intangible assets	$ 67.1		$ 72.6
Sacramento Container Corporation | Customer Relationships
Finite Lived Intangible Assets [Line Items]
Other intangible assets				$ 61.9
Sacramento Container Corporation | Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Other intangible assets				5.1
Sacramento Container Corporation | Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Other intangible assets				$ 0.1
Englander | Customer Relationships
Finite Lived Intangible Assets [Line Items]
Other intangible assets		$ 13.2
Englander | Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Other intangible assets		0.8
Englander | Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Other intangible assets		$ 0.1