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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mortgage loans        
Allowance for credit losses at beginning $ 8.8 $ 8.3 $ 11.8 $ 6.7
Current period provision for expected credit losses (0.5) 3.3 (3.5) 4.9
Initial allowance recognized for purchased financial assets with credit deterioration 0.0 0.0 0.0 0.0
Write-offs charged against the allowance 0.0 0.0 0.0 0.0
Recoveries of amounts previously written off 0.0 0.0 0.0 0.0
Allowance for credit losses at ending $ 8.3 $ 11.6 $ 8.3 $ 11.6