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OTHER OPERATING STATEMENT DATA - SCHEDULE OF CHANGES IN PRESENT VALUE OF FUTURE INSURANCE PROFITS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period $ 180.7 $ 203.7 $ 230.1
Amortization expense (19.7) (23.0) (26.4)
End of period 161.0 180.7 203.7
Supplemental health      
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period 141.0 154.0 168.1
Amortization expense (12.2) (13.0) (14.1)
End of period 128.8 141.0 154.0
Medicare supplement      
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period 20.6 27.5 36.5
Amortization expense (4.9) (6.9) (9.0)
End of period 15.7 20.6 27.5
Long-term care      
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period 5.2 6.2 7.3
Amortization expense (0.8) (1.0) (1.1)
End of period 4.4 5.2 6.2
Traditional life      
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period 12.9 14.8 16.9
Amortization expense (1.6) (1.9) (2.1)
End of period 11.3 12.9 14.8
Fixed indexed annuities      
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period 0.7 0.8 0.9
Amortization expense (0.2) (0.1) (0.1)
End of period 0.5 0.7 0.8
Fixed interest annuities      
Movement in Present Value of Future Insurance Profits [Roll Forward]      
Beginning of period 0.3 0.4 0.4
Amortization expense 0.0 (0.1) 0.0
End of period $ 0.3 $ 0.3 $ 0.4