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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 72.0	$ 59.4	$ 207.0	$ 179.0
Depreciation and amortization	64.6	59.4	187.1	179.0
Share-based incentive compensation	12.1	12.7	32.3	41.3
Total Company restructuring charges	9.8	0.6	9.2	4.6
Liquibox
Depreciation and Amortization [Abstract]
Liquibox intangible amortization	(7.4)	0.0	(19.9)	0.0
Food
Depreciation and Amortization [Abstract]
Total Company restructuring charges	5.7	0.6	6.3	3.1
Food | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	48.1	34.4	135.8	103.7
Protective
Depreciation and Amortization [Abstract]
Total Company restructuring charges	4.1	0.0	2.9	1.5
Protective | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 23.9	$ 25.0	$ 71.2	$ 75.3