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Earnings Per Share - Computations of Earnings (Loss) per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Income from continuing operations, net of tax $ 136.5 $ 141.4 $ 324.2 $ 411.9
(Loss) income from discontinued operations, net of tax 0.0 62.8 (1.0) 165.2
Net income $ 136.5 $ 204.2 $ 323.2 $ 577.1
Continuing operations $ 1.08 $ 1.09 $ 2.55 $ 3.14
Discontinued operations 0 0.49 0 1.26
Basic earnings per share 1.08 1.58 2.55 4.4
Continuing operations 1.07 1.09 2.53 3.12
Discontinued operations 0 0.48 0 1.25
Diluted earnings per share $ 1.07 $ 1.57 $ 2.53 $ 4.37
Basic average shares outstanding 126,900,000 129,300,000 127,100,000 131,000,000
Stock-based awards 900,000 800,000 800,000 1,000,000.0
Diluted average shares outstanding 127,800,000 130,100,000 127,900,000 132,000,000
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share 0.8 1.6 0.9 1.2