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Geographical Breakdown of Gross Written Premium (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 257.6 | $ 244.8 | $ 452.4 | $ 434.2
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%
California |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 60.0 | $ 43.2 | $ 100.5 | $ 76.0
California | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 23.30% | 17.70% | 22.20% | 17.50%
Texas |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 36.7 | $ 44.2 | $ 64.4 | $ 83.8
Texas | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 14.20% | 18.20% | 14.20% | 19.30%
Florida |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 37.1 | $ 38.0 | $ 62.7 | $ 59.5
Florida | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 14.40% | 15.50% | 13.90% | 13.70%
Illinois |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 8.9 | $ 7.3 | $ 14.9 | $ 12.4
Illinois | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 3.50% | 3.00% | 3.30% | 2.90%
Georgia |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 6.3 | $ 13.0 | $ 13.6 | $ 22.2
Georgia | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.40% | 5.30% | 3.00% | 5.10%
South Carolina |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 8.9 | $ 5.7 | $ 13.3 | $ 9.2
South Carolina | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 3.50% | 2.30% | 2.90% | 2.10%
New York |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 6.9 | $ 5.7 | $ 12.6 | $ 9.4
New York | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.70% | 2.30% | 2.80% | 2.20%
Colorado |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 5.1 | $ 6.7 | $ 9.2 | $ 12.5
Colorado | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 2.00% | 2.70% | 2.00% | 2.90%
New Jersey |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 4.5 | $ 4.0 | $ 9.1 | $ 8.3
New Jersey | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 1.70% | 1.60% | 2.00% | 1.90%
Ohio |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 4.4 | $ 4.2 | $ 9.0 | $ 7.9
Ohio | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 1.70% | 1.70% | 2.00% | 1.80%
Other |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Amount | $ 78.8 | $ 72.8 | $ 143.1 | $ 133.0
Other | Geographic Concentration Risk | Gross written premium |  |  |  |
Gross Written Premium [Line Items] |  |  |  |
Concentration risk, percentage (as a percent) | 30.60% | 29.70% | 31.70% | 30.60%

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