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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Gross cost at January 1	$ 298.9
Exchange effect	(2.8)
Gross cost at September 30	296.1
Accumulated amortization at January 1	(223.6)
Amortization expense	(12.0)	$ (16.3)
Exchange effect	1.4
Accumulated amortization at September 30	(234.2)
Net book amount at September 30	$ 61.9		$ 75.3

X

- Definition

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.

+ References

No definition available.

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- Definition

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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- Definition

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

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- Definition

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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- Definition

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

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- Definition

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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