Segments - Reconciliation of Net Earnings to Total Company Adjusted EBITDA-Depreciation and Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 61.1	$ 56.4	$ 135.0	$ 119.6
Depreciation and amortization	53.6	56.4	122.5	119.6
Share-based incentive compensation	2.2	10.7	20.2	28.6
Total Company restructuring charges	0.6	3.5	(0.6)	4.0
Liquibox
Depreciation and Amortization [Abstract]
Liquibox intangible amortization	(7.5)	0.0	(12.5)	0.0
Food
Depreciation and Amortization [Abstract]
Total Company restructuring charges	1.5	1.9	0.6	2.5
Food | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	41.0	32.8	87.7	69.3
Protective
Depreciation and Amortization [Abstract]
Total Company restructuring charges	(0.9)	1.6	(1.2)	1.5
Protective | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 20.1	$ 23.6	$ 47.3	$ 50.3