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Restructuring Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended					7 Months Ended	9 Months Ended		12 Months Ended	16 Months Ended	19 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019	Dec. 31, 2019	Mar. 30, 2020
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring							$ 55.9
Restructuring Charges		$ 20.1	$ 24.1	$ 17.6					$ 130.8		$ 192.6
2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Anticipated Business Combination Savings		180.0
Restructuring Costs						$ 200.0
Payments for Restructuring						150.0	69.3
Restructuring Charges		11.5	20.8	13.9					47.9		94.1
2018 Rigid Packaging Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs										$ 95.0
Payments for Restructuring							12.2			$ 65.0
Restructuring Charges		7.8	2.6	3.4					64.1		77.9
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
Minimum | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		20.0					20.0
Maximum | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		30.0					30.0
Subsequent Event | Minimum | 2018 Rigid Packaging Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	$ 5.0
Subsequent Event | Maximum | 2018 Rigid Packaging Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring	$ 10.0
Restructuring and Related Costs | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						165.0
Payments for Restructuring						115.0	38.3
Restructuring and Related Costs | Minimum | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		10.0					10.0
Restructuring and Related Costs | Maximum | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		$ 20.0					20.0
Integration Costs | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						35.0
Employee Costs
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring							39.0
Employee Costs | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						100.0
Fixed Asset Related Costs
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring							2.5
Fixed Asset Related Costs | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						30.0
Other Costs
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring							$ 14.4
Other Costs | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						15.0
Restructuring Related | 2019 Bemis Integration Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						$ 20.0

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