XML 60 R49.htm IDEA: XBRL DOCUMENT v3.23.3
INVESTMENTS - SUMMARY OF INVESTMENTS BY CONTRACTUAL MATURITY (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
Due after ten years 12,329.7 12,629.4
Subtotal 16,448.1 16,754.0
Structured securities 7,451.4 6,630.2
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
Due after ten years 9,723.2 10,523.2
Subtotal 13,506.3 14,334.6
Structured securities 6,798.9 6,018.8
Estimated fair value $ 20,305.2 $ 20,353.4