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 Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impairment Loss					$ 270.3
Amortization of intangible assets	$ 4.5	$ 5.5	$ 14.3	$ 16.9
Estimated Future Amortization Expense by Fiscal Year [Abstract]
2022	4.5		4.5
2023	17.7		17.7
2024	17.7		17.7
2025	17.7		17.7
2026	17.7		17.7
2027	17.7		17.7
After 2027	$ 173.2		$ 173.2