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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF INVESTMENTS WITH UNREALIZED LOSSES CLASSIFIED BY CONTRACTUAL MATURITY DATE (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Amortized cost  
Due after one year through five years $ 1,618.5
Due after five years through ten years 1,244.2
Total 19,348.2
Estimated fair value  
Due after one year through five years 1,551.5
Due after five years through ten years 1,166.8
Total 16,777.0
Investments held by variable interest entities - corporate securities  
Amortized cost  
Due in one year or less 3.1
Due after one year through five years 174.3
Due after five years through ten years 93.0
Total 270.4
Estimated fair value  
Due in one year or less 2.9
Due after one year through five years 169.0
Due after five years through ten years 92.5
Total $ 264.4