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Geographical Breakdown of Gross Written Premium (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Gross Written Premium [Line Items] |  |
Amount | $ 847.3 | $ 629.9
Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Texas |  |
Gross Written Premium [Line Items] |  |
Amount | $ 151.6 | $ 155.6
Texas | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 17.90% | 24.70%
California |  |
Gross Written Premium [Line Items] |  |
Amount | $ 156.7 | $ 116.3
California | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 18.50% | 18.50%
Florida |  |
Gross Written Premium [Line Items] |  |
Amount | $ 111.5 | $ 55.4
Florida | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 13.20% | 8.80%
Georgia |  |
Gross Written Premium [Line Items] |  |
Amount | $ 37.7 | $ 29.3
Georgia | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 4.40% | 4.70%
Illinois |  |
Gross Written Premium [Line Items] |  |
Amount | $ 25.9 | $ 22.7
Illinois | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 3.10% | 3.60%
Colorado |  |
Gross Written Premium [Line Items] |  |
Amount | $ 23.4 | $ 19.3
Colorado | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 2.80% | 3.10%
Missouri |  |
Gross Written Premium [Line Items] |  |
Amount | $ 15.8 | $ 15.0
Missouri | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 1.90% | 2.40%
Arizona |  |
Gross Written Premium [Line Items] |  |
Amount | $ 18.3 | $ 14.3
Arizona | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 2.20% | 2.30%
Ohio |  |
Gross Written Premium [Line Items] |  |
Amount | $ 15.2 | $ 13.8
Ohio | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 1.80% | 2.20%
New Jersey |  |
Gross Written Premium [Line Items] |  |
Amount | $ 17.2 | $ 14.0
New Jersey | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 2.00% | 2.20%
Other |  |
Gross Written Premium [Line Items] |  |
Amount | $ 274.0 | $ 174.2
Other | Geographic Concentration Risk | Gross written premium |  |
Gross Written Premium [Line Items] |  |
Concentration risk, percentage | 32.30% | 27.70%

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