Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Goodwill [Line Items]
Amortization expense associated with identifiable intangible assets	$ 4.5	$ 3.9	$ 13.1	$ 12.1
Estimated total amortization expense 2023	17.4		17.4
Estimated total amortization expense 2024	15.0		15.0
Estimated total amortization expense 2025	12.1		12.1
Estimated total amortization expense 2026	10.4		10.4
Estimated total amortization expense 2027	9.1		9.1
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 154.8		$ 154.8		$ 154.8