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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] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 438.7	$ 431.8
Realized/unrealized gains/(losses):
Relating to assets still held at the reporting date	(2.2)	16.9
Purchases, issuances and settlements	(438.8)	(33.7)
Exchange effect	2.3	23.7
Ending balance	$ 0.0	$ 438.7

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