GEOGRAPHICAL BREAKDOWN OF GROSS PREMIUMS WRITTEN (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Effects of Reinsurance [Line Items]
Total	$ 339.7	$ 346.2	$ 728.7	$ 757.0
Texas
Effects of Reinsurance [Line Items]
Total	61.0	70.8	128.9	145.9
Georgia
Effects of Reinsurance [Line Items]
Total	38.5	41.0	84.9	87.5
Florida
Effects of Reinsurance [Line Items]
Total	32.6	26.8	72.2	57.9
California
Effects of Reinsurance [Line Items]
Total	36.2	24.3	71.2	50.0
Pennsylvania
Effects of Reinsurance [Line Items]
Total	18.3	20.5	39.6	44.2
Colorado
Effects of Reinsurance [Line Items]
Total	15.9	18.6	33.5	40.5
Nevada
Effects of Reinsurance [Line Items]
Total	12.6	8.1	24.6	20.3
South Carolina
Effects of Reinsurance [Line Items]
Total	9.2	10.2	23.2	28.0
Arizona
Effects of Reinsurance [Line Items]
Total	11.1	11.5	23.1	25.1
Oklahoma
Effects of Reinsurance [Line Items]
Total	7.4	8.0	16.2	18.0
All other states
Effects of Reinsurance [Line Items]
Total	$ 96.9	$ 106.4	$ 211.3	$ 239.6
Geographic Concentration Risk \| Gross Written Premiums
Effects of Reinsurance [Line Items]
% of Total	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk \| Gross Written Premiums \| Texas
Effects of Reinsurance [Line Items]
% of Total	18.00%	20.50%	17.70%	19.30%
Geographic Concentration Risk \| Gross Written Premiums \| Georgia
Effects of Reinsurance [Line Items]
% of Total	11.30%	11.80%	11.70%	11.60%
Geographic Concentration Risk \| Gross Written Premiums \| Florida
Effects of Reinsurance [Line Items]
% of Total	9.60%	7.70%	9.90%	7.60%
Geographic Concentration Risk \| Gross Written Premiums \| California
Effects of Reinsurance [Line Items]
% of Total	10.60%	7.00%	9.80%	6.60%
Geographic Concentration Risk \| Gross Written Premiums \| Pennsylvania
Effects of Reinsurance [Line Items]
% of Total	5.40%	5.90%	5.40%	5.80%
Geographic Concentration Risk \| Gross Written Premiums \| Colorado
Effects of Reinsurance [Line Items]
% of Total	4.70%	5.40%	4.60%	5.40%
Geographic Concentration Risk \| Gross Written Premiums \| Nevada
Effects of Reinsurance [Line Items]
% of Total	3.70%	2.30%	3.40%	2.70%
Geographic Concentration Risk \| Gross Written Premiums \| South Carolina
Effects of Reinsurance [Line Items]
% of Total	2.70%	3.00%	3.20%	3.70%
Geographic Concentration Risk \| Gross Written Premiums \| Arizona
Effects of Reinsurance [Line Items]
% of Total	3.30%	3.30%	3.20%	3.30%
Geographic Concentration Risk \| Gross Written Premiums \| Oklahoma
Effects of Reinsurance [Line Items]
% of Total	2.20%	2.30%	2.20%	2.40%
Geographic Concentration Risk \| Gross Written Premiums \| All other states
Effects of Reinsurance [Line Items]
% of Total	28.50%	30.80%	28.90%	31.60%