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Policyholder Contract Liabilities - Policyholder Contract Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment Holdings [Line Items] |  |
Policyholder Obligations | $ 637.7 | $ 655.7
Universal Life-type Policyholder Account Balances |  |
Investment Holdings [Line Items] |  |
Policyholder Obligations | 96.4 | 98.3
United Insurance | FHLB of Chicago |  |
Investment Holdings [Line Items] |  |
Policyholder Obligations | $ 541.3 | $ 557.4

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