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Earnings (Losses) Per Share (Schedule of Earnings (Losses) Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net (loss) income attributable to the Company $ (1.7) $ 2.0 $ 182.7 $ 208.7
Basic weighted-average shares 104.2 105.3 104.4 107.8
Effect of dilutive restricted stock units (“RSUs”) 0.0 0.2 0.3 0.3
Diluted weighted-average shares 104.2 105.5 104.7 108.1
Basic [1] $ (0.02) $ 0.02 $ 1.75 $ 1.94
Diluted [1] $ (0.02) $ 0.02 $ 1.75 $ 1.93
[1] Net income (loss) per share may not recalculate due to rounding.