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Segment Information - Segment Sales to External Customers by Product Line (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]      
Net sales $ 8,478.0 $ 7,730.3 $ 6,658.2
Packaging      
Revenue from External Customer [Line Items]      
Net sales 7,780.7 7,052.6 5,919.5
Paper      
Revenue from External Customer [Line Items]      
Net sales 622.1 599.7 674.8
Operating Segments      
Revenue from External Customer [Line Items]      
Net sales 8,478.0 7,730.3 6,658.2
Operating Segments | Packaging      
Revenue from External Customer [Line Items]      
Net sales 7,780.7 7,052.6 5,919.5
Operating Segments | Paper      
Revenue from External Customer [Line Items]      
Net sales 622.1 599.7 674.8
Operating Segments | Corporate and Other      
Revenue from External Customer [Line Items]      
Net sales $ 75.2 $ 78.0 $ 63.9