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Earnings Per Share (Schedule of Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Line Items]      
Net Income (Loss) $ 216.8 $ 263.0 $ 1,241.1
Basic weighted-average shares 104.3 107.0 111.0
Diluted weighted-average shares 104.6 107.3 111.4
Basic $ 2.08 $ 2.46 $ 11.18
Diluted $ 2.07 $ 2.45 $ 11.14
RSUs      
Earnings Per Share [Line Items]      
Effect of dilutive RSUs [1] 0.3 0.3 0.4
[1] Includes 32 thousand dilutive PRSUs for the year ended December 31, 2023.