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Segments - Reconciliation of Net Earnings to Total Company Adjusted EBITDA-Depreciation and Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 70.7	$ 72.0	$ 206.9	$ 207.0
Depreciation and amortization, net of adjustments	63.2	64.6	184.2	187.1
Share-based incentive compensation	8.5	12.1	24.4	32.3
Total Company restructuring charges	6.8	9.8	24.8	9.2
Liquibox
Depreciation and Amortization [Abstract]
Liquibox intangible amortization	(7.5)	(7.4)	(22.7)	(19.9)
Food
Depreciation and Amortization [Abstract]
Total Company restructuring charges	4.7	5.7	15.3	6.3
Food | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	47.9	48.1	141.1	135.8
Protective
Depreciation and Amortization [Abstract]
Total Company restructuring charges	2.1	4.1	9.5	2.9
Protective | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 22.8	$ 23.9	$ 65.8	$ 71.2

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- Definition

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- Definition

Depreciation, Depletion and Amortization, Including Allocated Share-Based Compensation Expense, Net Of Adjustments

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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