Segment and Other Information - Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net sales	$ 1,461.0	$ 1,804.1	$ 4,428.5	$ 5,482.9
Depreciation and amortization	9.4	10.8	29.1	34.6
Restructuring charges, net	0.0	1.4	0.0	5.5
Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,461.0	1,784.8	4,428.5	5,404.5
Adjusted EBITDA	152.4	195.0	452.0	545.3
Depreciation and amortization	7.8	7.6	23.1	24.5
Restructuring charges, net		1.3		5.4
Corporate & Other
Segment Reporting Information [Line Items]
Net sales	0.0	19.3	0.0	78.4
Adjusted EBITDA	(44.2)	(53.7)	(127.8)	(148.2)
Depreciation and amortization	1.6	3.2	6.0	10.1
Restructuring charges, net		0.1		0.1
Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net sales	890.3	988.1	2,692.6	2,992.8
Adjusted EBITDA	108.1	115.1	313.4	320.9
Depreciation and amortization	5.3	5.4	15.9	17.2
Restructuring charges, net		0.9		3.4
Facility Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	183.6	180.1	551.1	605.3
Adjusted EBITDA	17.6	15.6	50.7	45.0
Depreciation and amortization	1.3	1.2	3.7	4.1
Restructuring charges, net		0.2		0.7
Print Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	387.1	616.6	1,184.8	1,806.4
Adjusted EBITDA	26.7	64.3	87.9	179.4
Depreciation and amortization	$ 1.2	1.0	$ 3.5	3.2
Restructuring charges, net		$ 0.2		$ 1.3