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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 760.5  
Due after one year through five years 2,285.7  
Due after five years through ten years 1,991.4  
Amortized cost 25,246.4  
Estimated fair value    
Due in one year or less 772.8  
Due after one year through five years 2,249.1  
Due after five years through ten years 1,991.7  
Estimated fair value 23,724.7 $ 21,506.2
Variable Interest Entity, Primary Beneficiary    
Amortized cost    
Due in one year or less 9.1  
Due after one year through five years 235.4  
Due after five years through ten years 14.3  
Amortized cost 258.8  
Estimated fair value    
Due in one year or less 8.4  
Due after one year through five years 227.4  
Due after five years through ten years 14.3  
Estimated fair value $ 250.1