Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Goodwill [Line Items]
Amortization expense associated with identifiable intangible assets	$ 4.9	$ 4.9	$ 9.9	$ 9.2
Estimated total amortization expense 2026	19.6		19.6
Estimated total amortization expense 2027	18.3		18.3
Estimated total amortization expense 2028	16.7		16.7
Estimated total amortization expense 2029	15.7		15.7
Estimated total amortization expense 2030	11.1		11.1
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 283.7		$ 283.7		$ 283.7