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Restructuring Plans - Restructuring Plan Costs (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended	19 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019	Mar. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 20.1	$ 24.1	$ 17.6				$ 130.8	$ 192.6
2018 Rigid Packaging Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7.8	2.6	3.4				64.1	77.9
2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	11.5	20.8	13.9				47.9	94.1
Restructuring Related Costs	2.0	1.5	3.6				1.8
Other Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0.8	$ 0.7	$ 0.3	$ 1.5	$ 1.8	$ 16.2	$ 18.8	$ 20.6

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Restructuring Related Costs

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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