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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Variable Interest Entity [Line Items]          
Total amortized cost $ 880.6   $ 880.6    
Variable interest entity, gross unrealized gains fixed maturity securities 1.9   1.9    
Variable interest entity gross unrealized losses fixed maturity securities 21.5   21.5    
Variable interest entity, allowance for credit losses fixed maturity securities 2.9   2.9    
Estimated fair value of fixed maturity securities 858.1   858.1    
Variable interest entities net realized gain (losses) on investments     4.2 $ 6.7  
Variable interest entities net loss from sale of fixed maturity investments     (6.8) (3.9)  
Variable interest entities, change in allowance for credit losses $ 1.6 $ 5.7 2.6 (2.8)  
Variable interest entity, gross investment losses     6.9 3.9  
Variable interest entities, investments sold     $ 18.5 $ 55.9  
Number of investments held by VIE, in default | investment 0   0    
Fair value of investments in unrealized loss position for less than 12 months $ 2,212.8   $ 2,212.8   $ 7,636.9
Gross unrealized losses of investments in unrealized loss position for less than 12 months 108.1   108.1   835.2
Fair value of investments in unrealized loss position for more than 12 months 8,074.1   8,074.1   1,897.5
Gross unrealized losses of investments in unrealized loss position for more than 12 months 1,442.7   1,442.7   471.6
Investments held in limited partnerships 540.1   540.1    
Unfunded commitments to limited partnerships 523.7   523.7    
Investments held by variable interest entities - corporate securities          
Variable Interest Entity [Line Items]          
Fair value of investments in unrealized loss position for less than 12 months 90.6   90.6   392.2
Gross unrealized losses of investments in unrealized loss position for less than 12 months 0.3   0.3   14.2
Fair value of investments in unrealized loss position for more than 12 months 447.3   447.3   477.9
Gross unrealized losses of investments in unrealized loss position for more than 12 months $ 11.4   $ 11.4   $ 17.3