Income Taxes - Income (Loss) Before Income Taxes and Noncontrolling Interest (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Federal	[1]	$ 1.9	$ (9.9)	$ (10.1)
International	[2]	717.0	628.8	560.7
Income from continuing operations before income taxes		$ 718.9	$ 618.9	$ 550.6

[1] “Federal” reflects United Kingdom (“U.K.”) income (loss) from continuing operations before income taxes, given U.K. tax residency.

[2] “International” reflects non-U.K. income from continuing operations before income taxes.