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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
investment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]      
Repayments of investment borrowings related to variable interest entities, amounts due in 2025 $ 94.1    
Repayments of investment borrowings related to variable interest entities, amounts due in 2026 40.2    
Repayments of investment borrowings related to variable interest entities, amounts due in 2027 33.3    
Repayments of investment borrowings related to variable interest entities, amounts due in 2028 55.0    
Repayments of investment borrowings related to variable interest entities, amounts due in 2029 and thereafter 276.0    
Debt securities, available-for-sale at amortized cost 25,264.3 $ 23,699.2  
Variable interest entity amortized cost securities held 437.0    
Variable interest entity, gross unrealized gains fixed maturity securities 1.2    
Variable interest entity gross unrealized losses fixed maturity securities 4.7    
Variable interest entity fixed maturity securities allowance for credit loss 1.3    
Variable interest entity, estimated fair value of securities held 432.3    
Estimated fair value 22,840.5 21,506.2  
Variable interest entities net realized gain (loss) on investments (16.9) (4.4) $ (8.1)
Variable interest entities net loss from sale of fixed maturity investments 18.7 6.8 6.3
Variable interest entities change in allowance for current expected credit losses 1.8 2.4 (1.8)
Variable interest entity, gross investment losses from sale 23.8 6.9 6.3
Investments held by VIEs and sold $ 199.6 18.5 $ 69.2
Number of VIEs in default | investment 0    
Fair value of investments in unrealized loss position for less than 12 months $ 2,982.0 1,169.9  
Gross unrealized losses of investments in unrealized loss position for less than 12 months 70.7 24.5  
Fair value of investments in unrealized loss position for more than 12 months 8,488.3 10,886.4  
Gross unrealized losses of investments in unrealized loss position for more than 12 months 1,358.4 1,365.0  
Fixed Maturities      
Variable Interest Entity [Line Items]      
Estimated fair value $ 22,840.5 21,506.2  
Continuous unrealized loss position 20.00%    
Investments held by variable interest entities - corporate securities      
Variable Interest Entity [Line Items]      
Estimated fair value $ 432.3    
Fair value of investments in unrealized loss position for less than 12 months 183.2 24.8  
Gross unrealized losses of investments in unrealized loss position for less than 12 months 0.9 0.1  
Fair value of investments in unrealized loss position for more than 12 months 25.6 302.3  
Gross unrealized losses of investments in unrealized loss position for more than 12 months 0.3 8.7  
Below-investment Grade      
Variable Interest Entity [Line Items]      
Debt securities, available-for-sale at amortized cost $ 1,288.0    
Percentage of available-for-sale debt securities 5.10%    
Estimated fair value $ 1,225.5    
Available-for-sale securities, percentage of amortized cost 95.00%    
Continuous unrealized loss position 20.00%    
Gross unrealized losses of investments in unrealized loss position for less than 12 months $ 25.4    
Below-investment Grade | Fixed Maturities      
Variable Interest Entity [Line Items]      
Estimated fair value 1,225.5 $ 1,236.7  
Below-investment Grade | Investments held by variable interest entities - corporate securities      
Variable Interest Entity [Line Items]      
Debt securities, available-for-sale at amortized cost $ 423.5    
Percentage of available-for-sale debt securities 97.00%    
Estimated fair value $ 418.7    
Available-for-sale securities, percentage of amortized cost 99.00%