Earnings Per Share (Schedule of Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Line Items]
Net income attributable to the Company	$ 46.7	$ 45.9
Basic weighted-average shares	104.1	104.5
Diluted weighted-average shares	104.4	104.8
Basic	$ 0.45	$ 0.44
Diluted	$ 0.45	$ 0.44
RSUs and PRSUs
Earnings Per Share [Line Items]
Effect of dilutive restricted stock units ("RSUs") and performance restricted stock units ("PRSUs")	0.3	0.3