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GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Effects of Reinsurance [Line Items]
Total	$ 308.2	$ 145.0	$ 638.9	$ 279.7
Texas
Effects of Reinsurance [Line Items]
Total	61.7	23.8	123.3	43.3
Georgia
Effects of Reinsurance [Line Items]
Total	41.1	15.8	80.5	29.7
Florida
Effects of Reinsurance [Line Items]
Total	28.4	2.0	44.0	3.8
Colorado
Effects of Reinsurance [Line Items]
Total	17.3	11.9	35.5	22.5
Pennsylvania
Effects of Reinsurance [Line Items]
Total	17.8	7.6	35.3	16.9
South Carolina
Effects of Reinsurance [Line Items]
Total	9.6	10.6	31.6	16.8
Arizona
Effects of Reinsurance [Line Items]
Total	12.7	6.0	26.6	10.7
Ohio
Effects of Reinsurance [Line Items]
Total	8.6	4.9	20.1	8.6
Maryland
Effects of Reinsurance [Line Items]
Total	7.1	3.0	17.9	6.3
Utah
Effects of Reinsurance [Line Items]
Total	7.3	7.4	16.1	14.6
All others states
Effects of Reinsurance [Line Items]
Total	$ 96.6	$ 52.0	$ 208.0	$ 106.5
Geographic Concentration Risk | Gross Written Premiums | United States
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk | Gross Written Premiums | Texas
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	20.00%	16.40%	19.30%	15.50%
Geographic Concentration Risk | Gross Written Premiums | Georgia
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	13.30%	10.90%	12.60%	10.60%
Geographic Concentration Risk | Gross Written Premiums | Florida
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	9.20%	1.40%	6.90%	1.40%
Geographic Concentration Risk | Gross Written Premiums | Colorado
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	5.60%	8.20%	5.60%	8.00%
Geographic Concentration Risk | Gross Written Premiums | Pennsylvania
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	5.80%	5.20%	5.50%	6.00%
Geographic Concentration Risk | Gross Written Premiums | South Carolina
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	3.10%	7.30%	4.90%	6.00%
Geographic Concentration Risk | Gross Written Premiums | Arizona
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	4.10%	4.10%	4.20%	3.80%
Geographic Concentration Risk | Gross Written Premiums | Ohio
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	2.80%	3.40%	3.10%	3.10%
Geographic Concentration Risk | Gross Written Premiums | Maryland
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	2.30%	2.10%	2.80%	2.30%
Geographic Concentration Risk | Gross Written Premiums | Utah
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	2.40%	5.10%	2.50%	5.20%
Geographic Concentration Risk | Gross Written Premiums | All others states
Effects of Reinsurance [Line Items]
Concentration percentage (in percent)	31.40%	35.90%	32.60%	38.10%

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