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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gross cost at January 1	$ 315.1	$ 291.1
Additions	24.3	22.4
Exchange effect	(7.5)	1.6
Gross cost at December 31	331.9	315.1	$ 291.1
Accumulated amortization at January 1	(257.8)	(246.1)
Amortization expense	(12.6)	(10.6)	(14.0)
Exchange effect	3.9	(1.1)
Accumulated amortization at December 31	(266.5)	(257.8)	$ (246.1)
Net book amount at December 31	$ 65.4	$ 57.3

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Amount of increase (decrease) to amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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