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Geographical Breakdown of Gross Written Premium (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Gross Written Premium [Line Items] |  |
Amount | $ 210.9 | $ 194.7
Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 100.00% | 100.00%
California |  |
Gross Written Premium [Line Items] |  |
Amount | $ 45.9 | $ 40.5
California | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 21.80% | 20.80%
Texas |  |
Gross Written Premium [Line Items] |  |
Amount | $ 25.9 | $ 27.7
Texas | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 12.30% | 14.20%
Florida |  |
Gross Written Premium [Line Items] |  |
Amount | $ 31.9 | $ 25.6
Florida | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 15.10% | 13.10%
Illinois |  |
Gross Written Premium [Line Items] |  |
Amount | $ 5.9 | $ 7.3
Illinois | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 2.80% | 3.70%
Georgia |  |
Gross Written Premium [Line Items] |  |
Amount | $ 5.6 | $ 6.0
Georgia | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 2.70% | 3.00%
South Carolina |  |
Gross Written Premium [Line Items] |  |
Amount | $ 4.5 | $ 4.4
South Carolina | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 2.10% | 2.20%
New York |  |
Gross Written Premium [Line Items] |  |
Amount | $ 12.1 | $ 5.7
New York | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 5.70% | 2.90%
Colorado |  |
Gross Written Premium [Line Items] |  |
Amount | $ 4.4 | $ 4.1
Colorado | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 2.10% | 2.00%
New Jersey |  |
Gross Written Premium [Line Items] |  |
Amount | $ 4.2 | $ 4.0
New Jersey | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 2.00% | 2.00%
Ohio |  |
Gross Written Premium [Line Items] |  |
Amount | $ 4.6 | $ 3.0
Ohio | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 2.20% | 1.50%
Other |  |
Gross Written Premium [Line Items] |  |
Amount | $ 65.9 | $ 67.3
Other | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage (as a percent) | 31.20% | 34.60%

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