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Acquisitions - Pro Forma Information (Details) - Liquibox - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 1,381.8 | $ 1,497.1 | $ 4,137.0 | $ 4,513.5
Net earnings | $ 56.7 | $ 112.7 | $ 227.6 | $ 308.1

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