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FAIR VALUE MEASUREMENTS - SIGNIFICANT UNOBSERVABLE (LEVEL 3) INPUTS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 353.2 $ 297.9 $ 324.7 $ 302.1
Gains (losses) included in net income (1.1) 5.9 0.5 16.4
Gains (losses) included in accumulated other comprehensive loss (2.3) (2.5) (0.3) (8.3)
Purchases 82.8 19.9 254.4 33.6
Sales (14.2) (8.3) (20.0) (8.3)
Transfers into Level 3 149.6 5.4   10.4
Transfers Into Level 3     115.1  
Transfers out of Level 3 (16.4) (23.2) (122.8) (50.8)
Ending balance 551.6 295.1 551.6 295.1
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period (1.1) 5.9 0.5 16.5
Change in unrealized gains or losses for the period included in other comprehensive loss for assets held at the end of the reporting period (3.5) (3.3) (2.1) (9.9)
Fixed Maturities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 277.3 173.1 155.9 197.9
Gains (losses) included in net income (2.2) 0.1 (0.5) 4.4
Gains (losses) included in accumulated other comprehensive loss (2.3) (2.5) (0.3) (8.3)
Purchases 82.8 11.3 234.4 14.2
Sales (14.2) (5.3) (20.0) (3.9)
Transfers into Level 3 129.6 0.0   0.0
Transfers Into Level 3     115.1  
Transfers out of Level 3 (16.4) (23.2) (30.0) (50.8)
Ending balance 454.6 153.5 454.6 153.5
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period (2.2) 0.1 (0.5) 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 (3.5) (3.3) (2.1) (9.9)
Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 73.3 72.6 73.4 72.7
Gains (losses) included in net income 1.1 0.2 1.0 0.1
Gains (losses) included in accumulated other comprehensive loss 0.0 0.0 0.0 0.0
Purchases 0.0 0.0 20.0 0.0
Sales 0.0 0.0 0.0 0.0
Transfers into Level 3 20.0 0.0   0.0
Transfers Into Level 3     0.0  
Transfers out of Level 3 0.0 0.0 0.0 0.0
Ending balance 94.4 72.8 94.4 72.8
Change in unrealized gains or losses for the period included in net income for assets held at the end of the reporting period 1.1 0.2 1.0 0.2
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 0.0 0.0
Trading Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   0.0   0.0
Gains (losses) included in net income   0.0   (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   2.8   2.9
Transfers out of Level 3   0.0   0.0
Ending balance   2.8   2.8
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   (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        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 2.6 52.2 95.4 31.5
Gains (losses) included in net income 0.0 5.6 0.0 12.0
Gains (losses) included in accumulated other comprehensive loss 0.0 0.0 0.0 0.0
Purchases 0.0 8.6 0.0 19.4
Sales 0.0 (3.0) 0.0 (4.4)
Transfers into Level 3 0.0 2.6   7.5
Transfers Into Level 3     0.0  
Transfers out of Level 3 0.0 0.0 (92.8) 0.0
Ending balance 2.6 66.0 2.6 66.0
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 5.6 0.0 12.0
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 $ 0.0 $ 0.0