Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Goodwill [Line Items]
Amortization expense associated with identifiable intangible assets	$ 5.0	$ 4.5	$ 10.0	$ 8.6
Estimated total amortization expense 2024	19.8		19.8
Estimated total amortization expense 2025	16.9		16.9
Estimated total amortization expense 2026	15.2		15.2
Estimated total amortization expense 2027	13.8		13.8
Estimated total amortization expense 2028	12.3		12.3
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 236.7		$ 236.7		$ 236.7