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INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 2,189.0	$ 2,189.3
Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	2,189.0
Borrowings due July 2024 at 1.990% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.5
Interest rate	1.99%
Borrowings Due August 2024 at 0.640% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 27.0
Interest rate	0.64%
Borrowings due May 2025 at 5.695% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.7
Interest rate	5.695%
Borrowings Due June 2025 at 2.940% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 17.8
Interest rate	2.94%
Borrowings Due June 2025 at 5.910% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	5.91%
Borrowings due September 2025 at 5.690% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 125.0
Interest rate	5.69%
Borrowings due October 2025 at 5.834% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.834%
Borrowings due October 2025 at 5.824% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.824%
Borrowings due October 2025 at 5.801% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 57.7
Interest rate	5.801%
Borrowings due November 2025 at 5.834% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.834%
Borrowings Due December 2025 at 5.926% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	5.926%
Borrowings due January 2026 at 5.819% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.819%
Borrowings due January 2026 at 5.824% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.824%
Borrowings due January 2026 at 5.794% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.794%
Borrowings due May 2026 at 5.766% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 5.0
Interest rate	5.766%
Borrowings due May 2026 at 5.684% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.8
Interest rate	5.684%
Borrowings due May 2026 at 5.610% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.61%
Borrowings Due November 2026 at 5.814% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	5.814%
Borrowings Due December 2026 at 5.752% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	5.752%
Borrowings Due January 2027 at 5.667% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	5.667%
Borrowings Due January 2027 at 5.763% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.763%
Borrowings Due January 2027 at 5.759% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.759%
Borrowings Due January 2027 at 5.792% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.792%
Borrowings Due February 2027 at 5.734% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.734%
Borrowings due April 2027 at 5.630% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.63%
Borrowings due May 2027 at 5.640% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.64%
Borrowings due June 2027 at 5.710% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.71%
Borrowings due June 2027 at 5.933% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	5.933%
Borrowings Due July 2027 at 6.000% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	6.00%
Borrowings Due July 2027 at 6.044% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	6.044%
Borrowings Due August 2027 at 6.015% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	6.015%
Borrowings Due January 2028 at 5.755% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	5.755%
Borrowings Due January 2028 at 5.803% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.803%
Borrowings Due January 2028 at 5.824% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.824%
Borrowings Due February 2028 at 5.875% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 34.5
Interest rate	5.875%
Borrowings Due February 2028 at 5.824% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.824%
Borrowings Due February 2028 at 5.744% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.0
Interest rate	5.744%
Borrowings Due February 2028 at 5.830% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 22.0
Interest rate	5.83%
Borrowings Due February 2028 at 5.754% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.754%
Borrowings Due July 2028 at 5.720% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.0
Interest rate	5.72%
Borrowings Due August 2028 at 5.730% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 35.0
Interest rate	5.73%

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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