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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF UNDISCOUNTED AND DISCOUNTED EXPECTED GROSS PREMIUMS AND EXPECTED FUTURE BENEFITS (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums (Undiscounted) $ 0.0 $ 0.0
Expected future gross premiums (Discounted) 0.0 0.0
Future policy benefits 385.9 409.3
Expected future benefits and expenses (Discounted) 287.2 304.5
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums (Undiscounted) 9,031.2 8,866.2
Expected future gross premiums (Discounted) 5,287.4 5,310.3
Future policy benefits 10,163.1 10,948.7
Expected future benefits and expenses (Discounted) 5,635.3 5,686.2
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums (Undiscounted) 5,589.1 5,521.0
Expected future gross premiums (Discounted) 3,756.3 3,857.2
Future policy benefits 4,387.4 4,318.6
Expected future benefits and expenses (Discounted) 2,933.1 2,998.8
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums (Undiscounted) 2,967.0 2,974.1
Expected future gross premiums (Discounted) 2,054.0 2,097.9
Future policy benefits 7,483.6 7,546.5
Expected future benefits and expenses (Discounted) 3,974.6 4,069.4
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Expected future gross premiums (Undiscounted) 5,542.6 5,448.2
Expected future gross premiums (Discounted) 3,840.1 3,835.7
Future policy benefits 7,478.6 7,250.8
Expected future benefits and expenses (Discounted) $ 4,320.8 $ 4,271.7