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Acquisitions - Unaudited Proforma Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Net sales $ 7,027,900,000 $ 6,782,500,000 $ 6,429,700,000
Net income $ 124,800,000 $ 328,800,000 $ 360,700,000
Basic earnings per share (in dollars per share) $ 2.02 $ 5.35 $ 5.77
Diluted earnings per common share (in dollars per share) $ 1.99 $ 5.28 $ 5.64