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INVESTMENTS IN VARIABLE INTEREST ENTITIES - NARRATIVE (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
investment
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
investment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]          
Total amortized cost $ 1,239.0   $ 1,239.0    
Variable interest entity, gross unrealized gains fixed maturity securities 3.3   3.3    
Variable interest entity gross unrealized losses fixed maturity securities 5.6   5.6    
Variable interest entity, allowance for credit losses fixed maturity securities 3.2   3.2    
Estimated fair value of fixed maturity securities 1,233.5   1,233.5    
Variable interest entities net realized gain (losses) on investments     5.1 $ (21.3)  
Variable interest entities net loss from sale of fixed maturity investments     6.8 3.4  
Variable interest entities, change in allowance for credit losses $ 2.2 $ 9.9 11.9 (17.9)  
Variable interest entity, gross investment losses from sale     7.0 3.4  
Variable interest entities, investments sold     $ 43.7 $ 22.2  
Number of investments held by VIE, in default | investment 0   0    
Fair value, less than 12 months $ 550.0   $ 550.0   $ 885.0
Gross unrealized losses, less than 12 months 9.2   9.2   16.3
Fair value, 12 months or greater 191.1   191.1   324.8
Gross unrealized losses, 12 months or greater 2.9   2.9   7.2
Investments held in limited partnerships 591.6   591.6    
Unfunded commitments to limited partnerships 163.6   163.6    
Variable Interest Entity, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Fair value, less than 12 months 354.3   354.3   461.9
Gross unrealized losses, less than 12 months 1.9   1.9   4.9
Fair value, 12 months or greater 336.0   336.0   238.3
Gross unrealized losses, 12 months or greater $ 3.6   $ 3.6   $ 3.9