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INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 2,441.7	$ 2,188.8
Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	2,441.7
Borrowings Due September 2025 at 4.740% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 125.0
Interest rate	4.74%
Borrowings Due January 2026 at 4.768% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.768%
Borrowings Due January 2026 at 4.741% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.741%
Borrowings Due January 2026 at 4.700% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.70%
Borrowings Due May 2026 at 4.816% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 5.0
Interest rate	4.816%
Borrowings Due May 2026 at 4.590% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.8
Interest rate	4.59%
Borrowings Due May 2026 at 4.660% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.66%
Borrowings Due November 2026 at 4.864% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.864%
Borrowings Due December 2026 at 4.674% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.674%
Borrowings Due January 2027 at 4.627% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.627%
Borrowings Due January 2027 at 4.688% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.688%
Borrowings Due January 2027 at 4.717% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.717%
Borrowings Due February 2027 at 4.718% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.718%
Borrowings Due April 2027 at 4.574% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.574%
Borrowings Due May 2027 at 4.584% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.584%
Borrowings Due June 2027 at 4.760% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.76%
Borrowings Due June 2027 at 4.983% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.983%
Borrowings Due July 2027 at 4.741% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.5
Interest rate	4.741%
Borrowings Due July 2027 at 4.944% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.944%
Borrowings Due July 2027 at 4.961% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.961%
Borrowings Due September 2027 at 4.916% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.916%
Borrowings Due November 2027 at 4.736% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 57.7
Interest rate	4.736%
Borrowings Due December 2027 Rate at 4.742% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.742%
Borrowings Due December 2027 Rate at 4.758% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.758%
Borrowings Due December 2027 Rate at 4.751% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.751%
Borrowings Due January 2028 at 4.716% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.716%
Borrowings Due January 2028 at 4.706% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 134.5
Interest rate	4.706%
Borrowings Due January 2028 at 4.728% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.728%
Borrowings Due January 2028 at 4.782% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.782%
Borrowings Due January 2028 at 4.694% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.694%
Borrowings Due February 2028 at 4.785% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.785%
Borrowings Due February 2028 at 4.702% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.0
Interest rate	4.702%
Borrowings Due February 2028 at 4.772% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 22.0
Interest rate	4.772%
Borrowings Due February 2028 at 4.738% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.738%
Borrowings Due July 2028 at 4.771% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 27.0
Interest rate	4.771%
Borrowings Due July 2028 at 4.770% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.0
Interest rate	4.77%
Borrowings Due August 2028 at 4.780% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 35.0
Interest rate	4.78%
Borrowings Due September 2028 at 5.012% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 12.5
Interest rate	5.012%
Borrowings Due May 2029 at 4.876% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 42.2
Interest rate	4.876%
Borrowings Due April 2030 at 4.904% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.904%
Borrowings Due May 2030 at 4.894% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.894%
Borrowings Due May 2030 at 4.905% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.905%
Borrowings Due May 2030 at 4.912% | Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.912%

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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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