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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF INVESTMENTS CLASSIFIED BY CONTRACTUAL MATURITY DATE (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 687.7  
Due after one year through five years 2,378.9  
Due after five years through ten years 2,056.3  
Total 25,264.3  
Estimated fair value    
Due in one year or less 705.3  
Due after one year through five years 2,322.4  
Due after five years through ten years 2,004.4  
Total 22,840.5 $ 21,506.2
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 315.3  
Due after five years through ten years 118.6  
Total 437.0  
Estimated fair value    
Due in one year or less 3.0  
Due after one year through five years 311.0  
Due after five years through ten years 118.3  
Total $ 432.3