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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
investment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Variable Interest Entity [Line Items]      
Interest expense $ 50.9 $ 62.0  
Variable interest entities net realized gain (losses) on investments (1.3) (3.5)  
Net losses from the sales of fixed maturities (0.9) (2.2)  
Variable interest entities, change in allowance for credit losses 0.4 1.3  
Variable interest entity, gross investment losses from sale 0.9 (2.4)  
Variable interest entities, investments sold $ 5.1 47.1  
Number of investments held by VIE, in default | investment 0    
Less than 12 months $ 4,728.1   $ 1,864.0
Gross unrealized losses of investments in unrealized loss position for less than 12 months 99.3   58.5
12 months or greater 5,045.5   5,964.9
Gross unrealized losses of investments in unrealized loss position for more than 12 months 827.8   836.7
Investments held in limited partnerships 763.5    
Unfunded commitments to limited partnerships 662.3    
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Interest expense 3.8 $ 7.5  
Less than 12 months 89.2   86.7
Gross unrealized losses of investments in unrealized loss position for less than 12 months 1.4   0.9
12 months or greater 84.1   34.2
Gross unrealized losses of investments in unrealized loss position for more than 12 months 2.1   $ 0.3
Variable Interest Entity, Primary Beneficiary | Non Investment Grade      
Variable Interest Entity [Line Items]      
Total amortized cost 292.1    
Variable interest entity, gross unrealized gains fixed maturity securities 0.3    
Variable interest entity gross unrealized losses fixed maturity securities 4.0    
Variable interest entity, allowance for credit losses fixed maturity securities 1.0    
Variable Interest Entity, Not Primary Beneficiary | Non Investment Grade      
Variable Interest Entity [Line Items]      
Estimated fair value of fixed maturity securities $ 287.4