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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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Goodwill [Line Items]
Amortization expense associated with identifiable intangible assets	$ 3.9	$ 3.7	$ 12.1	$ 9.8
Estimated total amortization expense on intangible assets 2021	16.2		16.2
Estimated total amortization expense on intangible assets 2022	17.1		17.1
Estimated total amortization expense on intangible assets 2023	14.8		14.8
Estimated total amortization expense on intangible assets 2024	11.9		11.9
Estimated total amortization expense on intangible assets 2025	10.2		10.2
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 154.8		$ 154.8		$ 154.8