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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Liabilities for Insurance Products Related to Fixed Indexed Annuity (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Total fixed indexed annuity insurance liabilities	$ 9,497.9	$ 9,153.4
Fixed Indexed Annuity
Policyholder Account Balance [Line Items]
Host contract liability	8,284.5	7,856.4
Embedded derivatives at fair value	$ 1,213.4	$ 1,297.0

X

- Definition

Fixed Indexed Annuity Insurance Liabilities

+ References

No definition available.

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- Definition

Host Contract Liability

+ References

No definition available.

+ Details

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X

- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29F
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29F

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Paragraph 7A
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-Publisher FASB
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