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Acquisitions - Schedule of Business Acquisitions, by Acquisition (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 917.3	$ 883.2	$ 737.9
Packaging
Business Acquisition [Line Items]
Goodwill		862.1	828.0	$ 682.7
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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Business combination, recognized identifiable assets acquired and liabilities assumed, net including goodwill.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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