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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Amortized cost    
Due in one year or less $ 240.4  
Due after one year through five years 2,164.6  
Due after five years through ten years 2,468.2  
Amortized cost 25,228.8  
Estimated fair value    
Due in one year or less 239.5  
Due after one year through five years 2,146.1  
Due after five years through ten years 2,477.3  
Estimated fair value 23,047.0 $ 22,730.1
Variable Interest Entity, Primary Beneficiary    
Amortized cost    
Due in one year or less 1.5  
Due after one year through five years 235.5  
Due after five years through ten years 143.9  
Amortized cost 380.9  
Estimated fair value    
Due in one year or less 1.5  
Due after one year through five years 232.3  
Due after five years through ten years 143.1  
Estimated fair value $ 376.9