Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Segment Reporting [Line Items] | ||||||||
| Total revenue | $ 336.1 | $ 194.5 | $ 888.5 | $ 509.8 | ||||
| less: Loss and loss adjustment expenses, net | 187.4 | 89.6 | 474.7 | 252.5 | ||||
| Other insurance expense | 29.2 | 24.1 | 80.0 | 71.6 | ||||
| Sales and marketing | 82.7 | 57.4 | 226.5 | 160.2 | ||||
| Technology development | 29.2 | 24.7 | 86.1 | 69.1 | ||||
| Income tax expense | 0.5 | 1.2 | 3.3 | 3.5 | ||||
| Net loss | (43.7) | $ (43.4) | $ (35.8) | (37.5) | $ (43.9) | $ (62.4) | (122.9) | (143.8) |
| Gain on early lease termination | 0.0 | 2.3 | ||||||
| Gain (loss) from litigation settlement | (1.0) | |||||||
| Income Tax Jurisdiction, Domestic Federal | CARES Act, ERC Program | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Tax credits received under ERC program | $ (11.7) | (11.7) | ||||||
| Reportable Segment | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Total revenue | 336.1 | 194.5 | 888.5 | 509.8 | ||||
| less: Loss and loss adjustment expenses, net | 187.4 | 89.6 | 474.7 | 252.5 | ||||
| Other insurance expense | 29.2 | 24.1 | 80.0 | 71.6 | ||||
| Sales and marketing | 12.1 | 11.3 | 37.1 | 26.3 | ||||
| Advertising expenses | 70.6 | 46.1 | 189.4 | 133.9 | ||||
| Technology development | 29.2 | 24.7 | 86.1 | 69.1 | ||||
| General and administrative | 40.1 | 30.3 | 113.5 | 87.2 | ||||
| Interest expense | 8.1 | 4.6 | 21.3 | 11.9 | ||||
| Depreciation and amortization | 2.6 | 3.4 | 7.7 | 12.6 | ||||
| Other expenses | 0.0 | (3.3) | (1.7) | (15.0) | ||||
| Income tax expense | 0.5 | 1.2 | 3.3 | 3.5 | ||||
| Net loss | $ (43.7) | $ (37.5) | $ (122.9) | $ (143.8) | ||||
| Other expenses | $ 1.7 | |||||||
| X | ||||||||||
- Definition General And Administrative, Less Interest, Depreciation and Other Segment Income (Expenses) No definition available.
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| X | ||||||||||
- Definition Other Insurance Expense No definition available.
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| X | ||||||||||
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expense for allocation of cost of tangible and intangible assets over their useful lives directly used in production of good and rendering of service. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of interest expense classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expense classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of other expense (income) and loss (gain) calculated as difference between segment revenue and separately disclosed expense category to arrive at segment profit (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate total amount of expenses directly related to the marketing or selling of products or services. No definition available.
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