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Segment Information - Segment Sales to External Customers by Product Line (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Net sales	$ 7,802.4	$ 8,478.0	$ 7,730.3
Packaging
Revenue from External Customer [Line Items]
Net sales	7,135.6	7,780.7	7,052.6
Paper
Revenue from External Customer [Line Items]
Net sales	595.4	622.1	599.7
Operating Segments
Revenue from External Customer [Line Items]
Net sales	7,802.4	8,478.0	7,730.3
Operating Segments | Packaging
Revenue from External Customer [Line Items]
Net sales	7,135.6	7,780.7	7,052.6
Operating Segments | Paper
Revenue from External Customer [Line Items]
Net sales	595.4	622.1	599.7
Operating Segments | Corporate and Other
Revenue from External Customer [Line Items]
Net sales	$ 71.4	$ 75.2	$ 78.0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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