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INVESTMENTS IN VARIABLE INTEREST ENTITIES - SCHEDULE OF VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Amortized cost    
Due in one year or less $ 171.9 $ 112.0
Due after one year through five years 2,217.5 1,913.7
Due after five years through ten years 1,729.0 2,098.9
Amortized cost 23,899.5 23,384.2
Estimated fair value    
Due in one year or less 161.9 110.8
Due after one year through five years 2,069.5 1,790.2
Due after five years through ten years 1,551.7 1,910.4
Estimated fair value 20,305.2 $ 20,353.4
Investments held by variable interest entities - corporate securities    
Amortized cost    
Due in one year or less 5.3  
Due after one year through five years 770.2  
Due after five years through ten years 105.1  
Amortized cost 880.6  
Estimated fair value    
Due in one year or less 4.6  
Due after one year through five years 750.4  
Due after five years through ten years 103.1  
Estimated fair value $ 858.1