Retirement Benefit Plans - Reconciliation of Beginning and Ending Balances of Foreign Pension Plan Assets Measured at Fair Value (Detail) - Foreign [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Schedule of Fair Values of Plan Assets [Line Items]
Plan assets at fair market value - beginning of year	$ 751.7	$ 667.2
Translation gain	(48.9)	56.7
Plan assets at fair market value - end of year	718.4	751.7
Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member]
Schedule of Fair Values of Plan Assets [Line Items]
Plan assets at fair market value - beginning of year	195.7
Change in fair value of assets	8.6
Net purchases and sales	(7.4)
Translation gain	(13.9)
Plan assets at fair market value - end of year	$ 183.0	$ 195.7