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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Gross cost at January 1	$ 331.9	$ 315.1
Additions	23.6	24.3
Exchange effect	17.8	(7.5)
Gross cost at December 31	373.3	331.9	$ 315.1
Accumulated amortization at January 1	(266.5)	(257.8)
Amortization expense	(11.6)	(12.6)	(10.6)
Impairment	(19.0)	0.0
Exchange effect	(8.5)	3.9
Accumulated amortization at December 31	(305.6)	(266.5)	$ (257.8)
Net book amount at December 31	$ 67.7	$ 65.4

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