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Acquisitions - Schedule of Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 888.7	$ 883.2
Packaging
Business Acquisition [Line Items]
Goodwill		833.5	828.0
Sacramento Container Corporation
Business Acquisition [Line Items]
Other intangible assets		67.1	72.6
Property, plant and equipment		26.7	26.7
Other net assets		23.4	23.4
Net assets acquired		273.8	273.8
Goodwill, Adjustments		5.5
Other intangible assets, Adjustments	$ (5.5)	(5.5)
Sacramento Container Corporation | Packaging
Business Acquisition [Line Items]
Goodwill		$ 156.6	$ 151.1

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