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Geographical Breakdown of Gross Written Premium (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 229.5 | $ 173.3 | $ 663.6 | $ 452.2
Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Texas |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 42.5 | $ 38.2 | $ 126.3 | $ 115.2
Texas | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 18.50% | 22.00% | 19.00% | 25.50%
California |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 40.6 | $ 32.8 | $ 116.6 | $ 86.1
California | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 17.70% | 18.90% | 17.70% | 19.00%
Florida |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 29.9 | $ 15.1 | $ 89.4 | $ 37.8
Florida | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 13.00% | 8.70% | 13.50% | 8.40%
Georgia |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 8.5 | $ 7.3 | $ 30.7 | $ 20.9
Georgia | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 3.70% | 4.20% | 4.60% | 4.60%
Colorado |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 5.6 | $ 5.5 | $ 18.1 | $ 12.7
Colorado | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.40% | 3.20% | 2.70% | 2.80%
Arizona |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 5.0 | $ 3.9 | $ 14.1 | $ 10.3
Arizona | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.20% | 2.40% | 2.10% | 2.30%
Illinois |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 7.5 | $ 6.6 | $ 19.9 | $ 16.0
Illinois | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 3.30% | 3.80% | 3.00% | 3.50%
New Jersey |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 4.5 | $ 4.7 | $ 12.8 | $ 9.2
New Jersey | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.00% | 2.70% | 1.90% | 2.00%
Ohio |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 3.3 | $ 3.9 | $ 11.2 | $ 10.3
Ohio | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 1.40% | 2.40% | 1.70% | 2.30%
Missouri |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 5.1 | $ 4.7 | $ 12.6 | $ 11.3
Missouri | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.20% | 2.70% | 1.90% | 2.50%
Other |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 77.0 | $ 50.6 | $ 211.9 | $ 122.4
Other | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 33.60% | 29.20% | 31.90% | 27.10%

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