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Stockholders’ Equity - Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 7.7	$ 8.4
Losses and loss adjustment expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	0.3	0.2
Insurance related expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1.2	0.4
Technology and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1.6	1.7
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1.0	1.9
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3.6	$ 4.2

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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