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Earnings Per Share (Schedule of Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Line Items]
Net income attributable to the Company	$ 189.6	$ (104.0)	$ 409.9	$ 58.7
Basic weighted-average shares	102.8	103.6	103.5	103.9
Diluted weighted-average shares	103.1	103.6	103.8	104.3
Basic	$ 1.84	$ (1)	$ 3.96	$ 0.56
Diluted	$ 1.84	$ (1)	$ 3.95	$ 0.56
RSUs and PRSUs
Earnings Per Share [Line Items]
Effect of dilutive restricted stock units ("RSUs") and performance restricted stock units ("PRSUs")	0.3	0.0	0.3	0.4

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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