Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Goodwill [Line Items]
Amortization expense associated with identifiable intangible assets	$ 5.5	$ 5.0	$ 14.7	$ 15.0
Estimated total amortization expense 2025	20.1		20.1
Estimated total amortization expense 2026	19.7		19.7
Estimated total amortization expense 2027	18.3		18.3
Estimated total amortization expense 2028	16.8		16.8
Estimated total amortization expense 2029	15.8		15.8
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 283.7		$ 283.7		$ 236.7