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INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 2,188.6	$ 2,188.8
Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	2,188.6
Borrowings Due May 2025 at 4.688% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.8
Interest rate	4.688%
Borrowings Due June 2025 at 2.940% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 17.3
Interest rate	2.94%
Borrowings Due September 2025 at 4.690% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 125.0
Interest rate	4.69%
Borrowings Due January 2026 at 4.732% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.732%
Borrowings Due January 2026 at 4.758% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.758%
Borrowings Due January 2026 at 4.747% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.747%
Borrowings Due May 2026 at 4.766% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 5.0
Interest rate	4.766%
Borrowings Due May 2026 at 4.637% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.8
Interest rate	4.637%
Borrowings Due May 2026 at 4.610% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.61%
Borrowings Due November 2026 at 4.814% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.814%
Borrowings Due December 2026 at 4.699% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.699%
Borrowings Due January 2027 at 4.647% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.647%
Borrowings Due January 2027 at 4.719% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.719%
Borrowings Due January 2027 at 4.764% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.764%
Borrowings Due February 2027 at 4.726% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.726%
Borrowings Due April 2027 at 4.617% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.617%
Borrowings Due May 2027 at 4.627% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.627%
Borrowings Due June 2027 at 4.710% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.71%
Borrowings Due June 2027 at 4.933% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.933%
Borrowings Due July 2027 at 4.780% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.5
Interest rate	4.78%
Borrowings Due July 2027 at 4.987% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.987%
Borrowings Due July 2027 at 5.000% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.00%
Borrowings Due September 2027 at 4.866% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.866%
Borrowings Due November 2027 at 4.776% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 57.7
Interest rate	4.776%
Borrowings Due December 2027 Rate at 4.773% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.773%
Borrowings Due December 2027 Rate at 4.766% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.766%
Borrowings Due December 2027 Rate at 4.790% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.79%
Borrowings Due January 2028 at 4.748% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.748%
Borrowings Due January 2028 at 4.738% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 134.5
Interest rate	4.738%
Borrowings Due January 2028 at 4.759% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.759%
Borrowings Due January 2028 at 4.813% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.813%
Borrowings Due January 2028 at 4.692% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.692%
Borrowings Due February 2028 at 4.789% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.789%
Borrowings Due February 2028 at 4.733% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.0
Interest rate	4.733%
Borrowings Due February 2028 at 4.745% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 22.0
Interest rate	4.745%
Borrowings Due February 2028 at 4.746% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.746%
Borrowings Due July 2028 at 4.810% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 27.0
Interest rate	4.81%
Borrowings Due July 2028 at 4.720% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.0
Interest rate	4.72%
Borrowings Due August 2028 at 4.730% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 35.0
Interest rate	4.73%
Borrowings Due September 2028 at 4.962% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.962%

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Amounts borrowed by a wholly owned subsidiary primarily from the Federal Home Loan Bank of Indianapolis; the proceeds of which were used to purchase fixed maturity securities.

+ References

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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