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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fixed Indexed Annuity Insurance Liability (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jan. 01, 2021
Policyholder Account Balance [Line Items]
Policyholder account balances	$ 15,481.8	$ 15,234.2	$ 15,079.7	$ 12,367.7
Total fixed indexed annuity insurance liabilities	9,497.9	9,153.4
Fixed Indexed Annuity
Policyholder Account Balance [Line Items]
Policyholder account balances	9,960.6	9,644.8
Future policy benefits	$ (462.7)	$ (491.4)

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Fixed Indexed Annuity Insurance Liabilities

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Liability for Future Policy Benefits, Adjusted, Net

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-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
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-Paragraph 29F
-Publisher FASB
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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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-Topic 944
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