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