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INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 2,691.7	$ 2,441.7
Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	2,691.7
Borrowings Due May 2026 at 4.056% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 5.0
Interest rate	4.056%
Borrowings Due May 2026 at 4.052% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.8
Interest rate	4.052%
Borrowings Due May 2026 at 3.900% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	3.90%
Borrowings Due November 2026 at 4.104% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.104%
Borrowings Due December 2026 at 4.097% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.097%
Borrowings Due January 2027 at 3.982% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	3.982%
Borrowings Due January 2027 at 4.058% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.058%
Borrowings Due January 2027 at 4.174% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.174%
Borrowings Due February 2027 at 4.128% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.128%
Borrowings Due April 2027 at 4.013% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.013%
Borrowings Due May 2027 at 4.023% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.023%
Borrowings Due June 2027 at 4.000% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.00%
Borrowings Due June 2027 at 4.223% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.223%
Borrowings Due July 2027 at 4.187% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.5
Interest rate	4.187%
Borrowings Due July 2027 at 4.383% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.383%
Borrowings Due September 2027 at 4.156% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.156%
Borrowings Due November 2027 at 4.183% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 57.7
Interest rate	4.183%
Borrowings Due December 2027 at 4.172% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.172%
Borrowings Due December 2027 at 4.168% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.168%
Borrowings Due December 2027 at 4.197% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.197%
Borrowings Due January 2028 at 4.151% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.151%
Borrowings Due January 2028 at 4.141% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 134.5
Interest rate	4.141%
Borrowings Due January 2028 at 4.098% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.098%
Borrowings Due January 2028 at 4.212% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.212%
Borrowings Due January 2028 at 4.095% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.095%
Borrowings Due February 2028 at 4.148% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.148%
Borrowings Due February 2028 at 4.132% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.0
Interest rate	4.132%
Borrowings Due February 2028 at 4.141% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 22.0
Interest rate	4.141%
Borrowings Due February 2028 at 4.148% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.148%
Borrowings Due July 2028 at 4.217% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 27.0
Interest rate	4.217%
Borrowings Due July 2028 at 4.010% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.0
Interest rate	4.01%
Borrowings Due August 2028 at 4.020% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 35.0
Interest rate	4.02%
Borrowings Due September 2028 at 4.252% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.252%
Borrowings Due May 2029 at 4.311% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 42.2
Interest rate	4.311%
Borrowings Due August 2029 at 4.307% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.307%
Borrowings Due April 2030 at 4.305% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.305%
Borrowings Due May 2030 at 4.333% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.333%
Borrowings Due May 2030 at 4.268% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.268%
Borrowings Due May 2030 at 4.281% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.281%
Borrowings Due September 2030 at 4.130% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 125.0
Interest rate	4.13%
Borrowings Due January 2031 at 4.127% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.127%
Borrowings Due January 2031 at 4.222% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.222%
Borrowings Due January 2031 at 4.171% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.171%
Borrowings Due February 2031 at 4.219% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 150.0
Interest rate	4.219%
Borrowings Due February 2031 at 4.264% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.264%

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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

No definition available.

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- Definition

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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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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