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Policyholder Contract Liabilities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 5.10% |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net | $ 276.6 | $ 294.1
Policyholder Account Balance, Cash Surrender Value | 96.4 | 98.2
FHLB of Chicago | United Insurance |  |
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] |  |
Federal Home Loan Bank, amount of advances | 101.7 | 122.5
Payments of FHLBank borrowings | $ 117.8 | $ 166.1

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- Definition Amount of cash to be paid to policyholder upon termination and surrender of long-duration contract issued by insurance entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
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- Definition Amount of advance from Federal Home Loan Bank (FHLBank). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478878/942-470-45-1 + Details
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- Definition Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, net of reinsurance recoverables, as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480109/944-80-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479808/944-20-55-15 + Details
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- Definition Weighted-average crediting rate for liability for policyholder account balance, calculated at a point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29F -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F + Details
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- Definition Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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