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INVESTMENT BORROWINGS - TERMS OF THE BORROWINGS FROM THE FHLB (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 1,641.5	$ 1,642.5
Federal Home Loan Bank Advances
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	1,641.5
Federal Home Loan Bank Advances | Borrowings due August 2021 at 2.550%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 27.1
Interest rate	2.55%
Federal Home Loan Bank Advances | Borrowings due June 2022 at 0.737%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 10.0
Interest rate	0.737%
Federal Home Loan Bank Advances | Borrowings due July 2022 at 0.558%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.558%
Federal Home Loan Bank Advances | Borrowings due August 2022 at 0.560%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.56%
Federal Home Loan Bank Advances | Borrowings due December 2022 at 0.435%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.435%
Federal Home Loan Bank Advances | Borrowings due December 2022 at .435%, loan 2
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.435%
Federal Home Loan Bank Advances | Borrowings due March 2023 at 2.160%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 22.0
Interest rate	2.16%
Federal Home Loan Bank Advances | Borrowings due July 2023 at 0.465%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.465%
Federal Home Loan Bank Advances | Borrowings due July 2023 at 0.472%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	0.472%
Federal Home Loan Bank Advances | Borrowings due April 2024 at 0.366%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	0.366%
Federal Home Loan Bank Advances | Borrowings due May 2024 at 0.548%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.548%
Federal Home Loan Bank Advances | Borrowings due May 2024 at 0.360%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 22.0
Interest rate	0.36%
Federal Home Loan Bank Advances | Borrowings due May 2024 at 0.625%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.625%
Federal Home Loan Bank Advances | Borrowings due June 2024 at 0.456%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 75.0
Interest rate	0.456%
Federal Home Loan Bank Advances | Borrowings due July 2024 at 0.504%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	0.504%
Federal Home Loan Bank Advances | Borrowings due July 2024 at 1.990%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.5
Interest rate	1.99%
Federal Home Loan Bank Advances | Borrowings due July 2024 at 0.690%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 34.5
Interest rate	0.69%
Federal Home Loan Bank Advances | Borrowings due July 2024 at 0.627%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 15.0
Interest rate	0.627%
Federal Home Loan Bank Advances | Borrowings due September 2024 at 0.733%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 25.0
Interest rate	0.733%
Federal Home Loan Bank Advances | Borrowings due May 2025 at 0.450%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.7
Interest rate	0.45%
Federal Home Loan Bank Advances | Borrowings due June 2025 at 2.940%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 19.2
Interest rate	2.94%
Federal Home Loan Bank Advances | Borrowings due September 2025 at 0.400%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 125.0
Interest rate	0.40%
Federal Home Loan Bank Advances | Borrowings due October 2025 at 0.605%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	0.605%
Federal Home Loan Bank Advances | Borrowings due October 2025 at 0.616%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	0.616%
Federal Home Loan Bank Advances | Borrowings due October 2025 at 0.537%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 57.7
Interest rate	0.537%
Federal Home Loan Bank Advances | Borrowings due November 2025 at 0.533%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.533%
Federal Home Loan Bank Advances | Borrowings due January 2026 at 0.512%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.512%
Federal Home Loan Bank Advances | Borrowings due January 2026 at 0.499%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.499%
Federal Home Loan Bank Advances | Borrowings due January 2026 at 0.535%
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 100.0
Interest rate	0.535%
Federal Home Loan Bank Advances | Borrowings Due May 2026 Rate One
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 21.8
Interest rate	0.425%
Federal Home Loan Bank Advances | Borrowings Due May 2026 Rate Two
Debt and Equity Securities, FV-NI [Line Items]
Investment borrowings	$ 50.0
Interest rate	0.32%

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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