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Segment Information - Selected Financial Information by Reportable 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	$ 1,936.0	$ 2,125.9	$ 5,864.5	$ 6,499.6
Operating Income (Loss)	258.6	360.3	813.6	1,132.7
Non-operating pension expense	(1.8)	3.6	(5.8)	10.9
Interest expense, net	(12.3)	(16.5)	(42.2)	(55.3)
Income before taxes	244.5	347.4	765.6	1,088.3
Trade
Segment Reporting Information [Line Items]
Net sales	1,936.0	2,125.9	5,864.5	6,499.6
Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,936.0	2,125.9	5,864.5	6,499.6
Segment Reconciling Items
Segment Reporting Information [Line Items]
Net sales	(45.2)	(42.9)	(130.9)	(125.4)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(45.2)	(42.9)	(130.9)	(125.4)
Packaging
Segment Reporting Information [Line Items]
Net sales	1,759.8	1,940.2	5,358.7	5,971.6
Operating Income (Loss)	256.8	359.2	810.5	1,141.3
Packaging | Trade
Segment Reporting Information [Line Items]
Net sales	1,755.2	1,935.1	5,344.3	5,956.8
Packaging | Intersegment
Segment Reporting Information [Line Items]
Net sales	4.6	5.1	14.4	14.8
Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,759.8	1,940.2	5,358.7	5,971.6
Paper
Segment Reporting Information [Line Items]
Net sales	157.9	165.3	451.6	468.6
Operating Income (Loss)	27.6	26.1	90.8	71.2
Paper | Trade
Segment Reporting Information [Line Items]
Net sales	157.9	165.3	451.6	468.6
Paper | Operating Segments
Segment Reporting Information [Line Items]
Net sales	157.9	165.3	451.6	468.6
Corporate and Other
Segment Reporting Information [Line Items]
Net sales	18.3	20.4	54.2	59.4
Operating Income (Loss)	(25.8)	(25.0)	(87.7)	(79.8)
Corporate and Other | Trade
Segment Reporting Information [Line Items]
Net sales	22.9	25.5	68.6	74.2
Corporate and Other | Intersegment
Segment Reporting Information [Line Items]
Net sales	40.6	37.8	116.5	110.6
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Net sales	$ 63.5	$ 63.3	$ 185.1	$ 184.8

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