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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INVESTMENT BORROWINGS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) subsidiary	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Number of insurance subsidiaries that are members of the FHLB | subsidiary	3
Investment borrowings	$ 2,188.8	$ 2,189.3
Interest expense on FHLB borrowings	123.2	$ 104.7	$ 33.5
Federal Home Loan Bank Advances
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Federal home loan bank stock	94.6
Federal home loan bank advances, collateral pledged	2,790.1
Investment borrowings	2,188.8
Federal Home Loan Bank Advances | Borrowings Due May 2025 at 4.773%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 21.8
Interest rate	4.773%
Federal Home Loan Bank Advances | Borrowings Due June 2025 at 2.940%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 17.5
Interest rate	2.94%
Federal Home Loan Bank Advances | Borrowings Due September 2025 at 4.720%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 125.0
Interest rate	4.72%
Federal Home Loan Bank Advances | Borrowings Due January 2026 at 5.072%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.072%
Federal Home Loan Bank Advances | Borrowings Due January 2026 at 5.047%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.047%
Federal Home Loan Bank Advances | Borrowings Due January 2026 at 4.790%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.79%
Federal Home Loan Bank Advances | Borrowings Due May 2026 at 4.796%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 5.0
Interest rate	4.796%
Federal Home Loan Bank Advances | Borrowings Due May 2026 at 4.680%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 21.8
Interest rate	4.68%
Federal Home Loan Bank Advances | Borrowings Due May 2026 at 4.640%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.64%
Federal Home Loan Bank Advances | Borrowings Due November 2026 at 4.844%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.844%
Federal Home Loan Bank Advances | Borrowings Due December 2026 at 4.710%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.71%
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 4.928%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.928%
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 5.082%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.082%
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 4.826%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.826%
Federal Home Loan Bank Advances | Borrowings Due January 2027 at 4.995%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.995%
Federal Home Loan Bank Advances | Borrowings Due February 2027 at 4.906%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.906%
Federal Home Loan Bank Advances | Borrowings Due April 2027 at 4.633%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.633%
Federal Home Loan Bank Advances | Borrowings Due May 2027 at 4.643%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.643%
Federal Home Loan Bank Advances | Borrowings Due June 2027 at 4.740%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.74%
Federal Home Loan Bank Advances | Borrowings Due June 2027 at 4.963%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 10.0
Interest rate	4.963%
Federal Home Loan Bank Advances | Borrowings Due July 2027 at 4.786%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 15.5
Interest rate	4.786%
Federal Home Loan Bank Advances | Borrowings Due July 2027 at 5.003%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.003%
Federal Home Loan Bank Advances | Borrowings Due July 2027 at 5.006%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.006%
Federal Home Loan Bank Advances | Borrowings Due August 2027 at 5.093%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.093%
Federal Home Loan Bank Advances | Borrowings Due September 2027 at 4.896%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.896%
Federal Home Loan Bank Advances | Borrowings Due November 2027 at 4.800%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 57.7
Interest rate	4.80%
Federal Home Loan Bank Advances | Borrowings Due December 2027 at 5.009%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	5.009%
Federal Home Loan Bank Advances | Borrowings Due December 2027 at 4.946%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.946%
Federal Home Loan Bank Advances | Borrowings Due December 2027 at 4.796%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	4.796%
Federal Home Loan Bank Advances | Borrowings Due January 2028 at 4.833%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 75.0
Interest rate	4.833%
Federal Home Loan Bank Advances | Borrowings Due January 2028 at 5.122%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.122%
Federal Home Loan Bank Advances | Borrowings Due January 2028 at 5.049%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 50.0
Interest rate	5.049%
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.953%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 34.5
Interest rate	4.953%
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.996%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.996%
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.985%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 22.0
Interest rate	4.985%
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.969%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 21.0
Interest rate	4.969%
Federal Home Loan Bank Advances | Borrowings Due February 2028 at 4.926%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 100.0
Interest rate	4.926%
Federal Home Loan Bank Advances | Borrowings Due July 2028 at 4.816%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 27.0
Interest rate	4.816%
Federal Home Loan Bank Advances | Borrowings Due July 2028 at 4.750%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 15.0
Interest rate	4.75%
Federal Home Loan Bank Advances | Borrowings Due August 2028 at 4.760%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 35.0
Interest rate	4.76%
Federal Home Loan Bank Advances | Borrowings Due September 2028 at 4.992%
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]
Investment borrowings	$ 12.5
Interest rate	4.992%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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