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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Realized investment gains (losses):        
Total realized investment losses $ (26.3) $ (21.8) $ (36.3) $ (36.4)
Change in allowance for credit losses 4.1 (9.9) 5.6 (11.4)
Change in fair value of equity securities (0.7) 0.0 0.2 0.4
Other changes in fair value 5.7 (3.6) 17.3 (2.5)
Gain on liquidation of variable interest entity 0.0 0.0 3.8 0.0
Other investment gains 9.1 (13.5) 26.9 (13.5)
Net realized investment gains (losses) (17.2) (35.3) (9.4) (49.9)
Variable interest entities, change in allowance for current expected credit losses (1.5) 1.0 (0.3) (1.0)
Increase (decrease) in equity securities, FV-NI, held at end of period (0.7) (0.5) 0.3 0.1
Change in estimated fair value of trading securities 0.0 (3.1) 4.7 (5.6)
Total Fixed Maturities, Available For Sale        
Realized investment gains (losses):        
Gross realized gains on sales of fixed maturities, available for sale 0.9 2.8 3.0 10.1
Gross realized losses on sales of fixed maturities, available for sale (27.6) (21.6) (33.5) (36.0)
Equity securities, net (0.1) (0.4) (0.1) (0.6)
Other, net $ 0.5 $ (2.6) $ (5.7) $ (9.9)