Segments - Reconciliation of Net Earnings to Total Company Adjusted EBITDA-Depreciation and Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 68.4	$ 73.9
Depreciation and amortization	60.9	68.9
Share-based incentive compensation	8.7	18.0
Total Company restructuring charges	15.5	(1.2)
Liquibox
Depreciation and Amortization [Abstract]
Liquibox intangible amortization	(7.5)	(5.0)
Food
Depreciation and Amortization [Abstract]
Total Company restructuring charges	8.6	(0.9)
Food | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	46.9	46.7
Protective
Depreciation and Amortization [Abstract]
Total Company restructuring charges	6.9	(0.3)
Protective | Operating Segments
Depreciation and Amortization [Abstract]
Total Company depreciation and amortization	$ 21.5	$ 27.2