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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Gross cost at January 1	$ 331.8
Additions	17.0
Exchange effect	17.8
Gross cost at March 31	366.6
Accumulated amortization at January 1	(266.4)
Amortization expense	(9.3)	$ (9.6)
Impairment	(19.1)
Exchange effect	(8.5)
Accumulated amortization at March 31	(303.3)
Net book amount at March 31	$ 63.3		$ 65.4

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