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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]          
Total amortized cost $ 258.8   $ 258.8    
Variable interest entity, gross unrealized gains fixed maturity securities 0.7   0.7    
Variable interest entity gross unrealized losses fixed maturity securities 7.6   7.6    
Variable interest entity, allowance for credit losses fixed maturity securities 1.8   1.8    
Estimated fair value of fixed maturity securities 250.1   250.1    
Variable interest entities net realized gain (losses) on investments     (12.5) $ (4.2)  
Variable interest entities net loss from sale of fixed maturity investments     (17.7) (6.8)  
Gain on liquidation of variable interest entities 0.1 $ 0.0 3.9 0.0  
Variable interest entities, change in allowance for current expected credit losses $ (1.0) $ (1.6) (1.3) (2.6)  
Variable interest entity, gross investment losses     18.9 6.9  
Variable interest entities, investments sold     $ 176.9 $ 18.5  
Number of investments held by VIE, in default | investment 0   0    
Fair value of investments in unrealized loss position for less than 12 months $ 597.9   $ 597.9   $ 1,169.9
Gross unrealized losses of investments in unrealized loss position for less than 12 months 3.4   3.4   24.5
Fair value of investments in unrealized loss position for more than 12 months 10,076.8   10,076.8   10,886.4
Gross unrealized losses of investments in unrealized loss position for more than 12 months 1,099.3   1,099.3   1,365.0
Investments held in limited partnerships 476.4   476.4    
Unfunded commitments to limited partnerships 416.9   416.9    
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Fair value of investments in unrealized loss position for less than 12 months 51.7   51.7   24.8
Gross unrealized losses of investments in unrealized loss position for less than 12 months 0.1   0.1   0.1
Fair value of investments in unrealized loss position for more than 12 months 46.3   46.3   302.3
Gross unrealized losses of investments in unrealized loss position for more than 12 months $ 1.1   $ 1.1   $ 8.7