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INVESTMENTS - SUMMARY OF CHANGES IN THE ALLOWANCE FOR CURRENT EXPECTED CREDIT LOSSES RELATED TO MORTGAGE LOANS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period $ 21.1 $ 13.2 $ 13.6 $ 15.4
Increase (decrease) in provision for expected credit losses (0.1) 3.3 7.4 1.1
Allowance at the end of the period $ 21.0 $ 16.5 $ 21.0 $ 16.5