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Acquisitions and Dispositions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Larson [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |
Net sales | $ 6,493.2 | $ 6,100.4
Net income | $ 592.5 | $ 410.8

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