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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 867.7  
Due after one year through five years 2,272.7  
Due after five years through ten years 1,738.0  
Amortized cost 25,106.1  
Estimated fair value    
Due in one year or less 860.9  
Due after one year through five years 2,178.7  
Due after five years through ten years 1,660.6  
Estimated fair value 22,617.9 $ 21,506.2
Variable Interest Entity, Primary Beneficiary    
Amortized cost    
Due in one year or less 13.2  
Due after one year through five years 413.2  
Due after five years through ten years 14.2  
Amortized cost 440.6  
Estimated fair value    
Due in one year or less 11.3  
Due after one year through five years 399.9  
Due after five years through ten years 14.3  
Estimated fair value $ 425.5