v3.26.1
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Mar. 31, 2026
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
shares
Jun. 30, 2025
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of reportable segment | segment       1  
Deferred premium tax credits $ 4.5     $ 4.5  
Cost of deferred premium tax credits 3.8     3.8  
Deferred policy acquisition costs, amortization expense $ 29.0   $ 18.3 $ 58.3 $ 29.7
Performance-based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares   0.4   0.4  
Performance-based Restricted Stock Units | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   1 year      
Performance-based Restricted Stock Units | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   2 years      
Performance-based Restricted Stock Units | Tranche 3          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Performance-based Restricted Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Actual number of performance-based restricted stock units (as percent)   0.00%      
Performance-based Restricted Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Actual number of performance-based restricted stock units (as percent)   200.00%