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Revenue - Summary of Revenues Disaggregated by Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025		Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,313.4	$ 2,182.4	$ 6,625.7		$ 6,237.2
Packaging
Disaggregation Of Revenue [Line Items]
Revenue	2,128.1	2,008.7	6,104.4		5,715.3
Paper
Disaggregation Of Revenue [Line Items]
Revenue	161.2	159.3	461.2		473.2
Corporate and Other
Disaggregation Of Revenue [Line Items]
Revenue	$ 24.1	$ 14.4	$ 60.1	[1]	$ 48.7
[1] The Corporate and Other segment sales to external customers is presented net of total company intersegment eliminations.

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