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Business Acquisitions - Summary of Purchase Price Allocation and Measurement Period Adjustment (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 13, 2025	Dec. 31, 2024
Business Acquisition [Line Items]
Goodwill	$ 601.8		$ 573.8
Insurtech Insights [Member]
Business Acquisition [Line Items]
Cash		$ 0.7
Trade and other receivables		4.6
Prepaid expenses and other current assets		1.7
Goodwill		27.3
Intangible assets		4.4
Deferred revenues		(9.4)
Accounts payable and other current liabilities		(3.0)
Deferred tax liability		(1.1)
Purchase price, including working capital adjustment		$ 25.2

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