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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Amortized cost    
Due in one year or less $ 756.5  
Due after one year through five years 2,301.3  
Due after five years through ten years 2,270.5  
Amortized cost 25,471.1  
Estimated fair value    
Due in one year or less 756.1  
Due after one year through five years 2,261.8  
Due after five years through ten years 2,242.2  
Estimated fair value 23,283.0 $ 22,840.5
Variable Interest Entity, Primary Beneficiary    
Amortized cost    
Due in one year or less 1.5  
Due after one year through five years 236.1  
Due after five years through ten years 149.5  
Amortized cost 387.1  
Estimated fair value    
Due in one year or less 1.4  
Due after one year through five years 231.0  
Due after five years through ten years 147.8  
Estimated fair value $ 380.2