Segments - Net Sales and Adjusted EBITDA by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total Company Net Sales	$ 1,328.5	$ 1,151.2	$ 2,595.6	$ 2,325.1
Segment Adjusted EBITDA:	265.4	260.6	532.2	509.7
Food
Segment Reporting Information [Line Items]
Total Company Net Sales	$ 736.7	$ 673.2	$ 1,438.9	$ 1,363.5
Food and Protective Adjusted EBITDA Margin	21.50%	25.10%	21.90%	23.90%
Food | Product Concentration Risk | Net Sales
Segment Reporting Information [Line Items]
As a % of Total Company net sales	55.50%	58.50%	55.40%	58.60%
Food | Operating Segments
Segment Reporting Information [Line Items]
Total Company Net Sales	$ 736.7	$ 673.2	$ 1,438.9	$ 1,363.5
Segment Adjusted EBITDA:	158.1	169.1	315.0	325.4
Protective
Segment Reporting Information [Line Items]
Total Company Net Sales	$ 591.8	$ 478.0	$ 1,156.7	$ 961.6
Food and Protective Adjusted EBITDA Margin	18.10%	19.10%	18.80%	19.20%
Protective | Product Concentration Risk | Net Sales
Segment Reporting Information [Line Items]
As a % of Total Company net sales	44.50%	41.50%	44.60%	41.40%
Protective | Operating Segments
Segment Reporting Information [Line Items]
Total Company Net Sales	$ 591.8	$ 478.0	$ 1,156.7	$ 961.6
Segment Adjusted EBITDA:	$ 107.3	$ 91.5	$ 217.2	$ 184.3