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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
investment
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
investment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Variable Interest Entity [Line Items]          
Total amortized cost $ 298.6   $ 298.6    
Variable interest entity, gross unrealized gains fixed maturity securities 0.5   0.5    
Variable interest entity gross unrealized losses fixed maturity securities 1.8   1.8    
Variable interest entity, allowance for credit losses fixed maturity securities 0.5   0.5    
Estimated fair value of fixed maturity securities 296.8   296.8    
Variable interest entities net realized gain (losses) on investments     (6.1) $ (12.5)  
Variable interest entities net loss from sale of fixed maturity investments     (6.9) (17.7)  
Variable interest entities, change in allowance for current expected credit losses     (0.8) (1.3)  
Variable interest entity, gross investment losses     7.3 18.9  
Variable interest entities, investments sold     88.2 176.9  
Gain on liquidation of variable interest entities $ 0.0 $ 0.1 $ 0.0 $ 3.9  
Number of investments held by VIE, in default | investment 0   0    
Fair value of investments in unrealized loss position for less than 12 months $ 1,019.0   $ 1,019.0   $ 2,982.1
Gross unrealized losses of investments in unrealized loss position for less than 12 months 10.9   10.9   70.6
Fair value of investments in unrealized loss position for more than 12 months 6,920.8   6,920.8   8,482.0
Gross unrealized losses of investments in unrealized loss position for more than 12 months 873.1   873.1   1,357.8
Investments held in limited partnerships 598.3   598.3    
Unfunded commitments to limited partnerships 639.4   639.4    
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Fair value of investments in unrealized loss position for less than 12 months 169.5   169.5   183.2
Gross unrealized losses of investments in unrealized loss position for less than 12 months $ 1.4   $ 1.4   0.9
Fair value of investments in unrealized loss position for more than 12 months         25.6
Gross unrealized losses of investments in unrealized loss position for more than 12 months         $ 0.3