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FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 324.7 $ 302.1
Gains (losses) included in net income (0.1) 10.7
Gains (losses) included in accumulated other comprehensive loss 2.9 (5.6)
Purchases 81.6 16.0
Sales (14.8) (1.6)
Transfers into Level 3 66.0 6.4
Transfers out of Level 3 (107.1) (30.1)
Ending balance 353.2 297.9
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period 0.0 10.7
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period 1.9 (6.5)
Total Fixed Maturities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 155.9 197.9
Gains (losses) included in net income 0.0 4.4
Gains (losses) included in accumulated other comprehensive loss 2.9 (5.6)
Purchases 81.6 6.8
Sales (14.8) (0.3)
Transfers into Level 3 66.0 0.0
Transfers out of Level 3 (14.3) (30.1)
Ending balance 277.3 173.1
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period 0.1 4.4
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period 1.9 (6.5)
Equity Securities | Corporate securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 73.4 72.7
Gains (losses) included in net income (0.1) (0.1)
Gains (losses) included in accumulated other comprehensive loss 0.0 0.0
Purchases 0.0 0.0
Sales 0.0 0.0
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 73.3 72.6
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period (0.1) (0.1)
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period 0.0 0.0
Other Invested Assets | Residual Tranches    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 95.4 31.5
Gains (losses) included in net income 0.0 6.4
Gains (losses) included in accumulated other comprehensive loss 0.0 0.0
Purchases 0.0 9.2
Sales 0.0 (1.3)
Transfers into Level 3 0.0 6.4
Transfers out of Level 3 (92.8) 0.0
Ending balance 2.6 52.2
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period 0.0 6.4
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period $ 0.0 $ 0.0