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INVESTMENTS - SCHEDULE OF INVESTMENTS CLASSIFIED BY CONTRACTUAL MATURITY DATE (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 687.7  
Due after one year through five years 2,378.9  
Due after five years through ten years 2,056.3  
Due after ten years 12,716.4  
Subtotal 17,839.3  
Structured securities 7,425.0  
Total 25,264.3  
Estimated fair value    
Due in one year or less 705.3  
Due after one year through five years 2,322.4  
Due after five years through ten years 2,004.4  
Due after ten years 10,719.1  
Subtotal 15,751.2  
Structured securities 7,089.3  
Total $ 22,840.5 $ 21,506.2