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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gross cost at January 1	$ 295.2	$ 298.9
Additions	2.7	0.0
Written down in the year	(4.1)	0.0
Exchange effect	(2.7)	(3.7)
Gross cost at December 31	291.1	295.2	$ 298.9
Accumulated amortization at January 1	(237.7)	(223.6)
Amortization expense	(14.0)	(16.0)	(20.9)
Written down in the year	4.1	0.0
Exchange effect	1.5	1.9
Accumulated amortization at December 31	(246.1)	(237.7)	$ (223.6)
Net book amount at December 31	$ 45.0	$ 57.5

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Amortization of finite lived intangible assets period increase decrease.

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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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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments.

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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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