Goodwill and Other Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Intangible Asset, Goodwill and Other [Abstract]
Intangible Asset, Finite-Lived, Amortization Expense	$ 15.1	$ 13.9	$ 46.5	$ 42.4
Impairment of intangible assets	$ 0.0	$ 0.0	$ 0.0		$ 30.9

Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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+ Details