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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance at the beginning of the period	$ 10.3	$ 4.9	$ 8.0	$ 5.6
Current period provision for expected credit losses	0.6	0.4	2.9	(0.3)
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 at the end of the period	$ 10.9	$ 5.3	$ 10.9	$ 5.3

X

- Definition

Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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