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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance at the beginning of the period $ 13.2 $ 10.3 $ 15.4 $ 8.0
Increase in provision for expected credit losses 3.3 0.6 1.1 2.9
Allowance at the end of the period $ 16.5 $ 10.9 $ 16.5 $ 10.9