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INVESTMENTS - SUMMARY OF INVESTMENTS BY CONTRACTUAL MATURITY (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  
Due after ten years 12,706.6  
Subtotal 18,034.9  
Structured securities 7,436.2  
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  
Due after ten years 10,867.5  
Subtotal 16,127.6  
Structured securities 7,155.4  
Estimated fair value $ 23,283.0 $ 22,840.5