Pension and Post-Employment Benefits - Reconciliation of Fair Value of Plan Assets Measured Using Significant Unobservable Inputs (Detail) - United Kingdom Plan [Member] - Significant Unobservable Inputs (Level 3) [Member] - Other Assets [Member] $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 438.7
Realized/unrealized gains/(losses):
Relating to assets still held at the reporting date	(2.2)
Purchases, issuances and settlements	(438.8)
Exchange effect	2.3
Ending balance	$ 0.0