Income Taxes - Income (Loss) Before Income Taxes and Noncontrolling Interest (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Federal	[1]	$ (11.2)	$ 7.2	$ (1.6)
International	[2]	638.0	424.9	409.1
Income from continuing operations before income taxes		$ 626.8	$ 432.1	$ 407.5
Federal statutory income tax rate		19.00%	19.00%	19.00%

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

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