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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Net Investment Income [Line Items] |  |
Investment grade rating | 97.90% |
Reverse repurchase agreement, cash to value percentage | 95.00% |
Securities sold under agreements to repurchase | $ 12.0 | $ 0.0
Fair Value | 5,387.9 | 5,235.3
FHLB funding agreements | 989.5 | 904.5
Fair Value |  |
Net Investment Income [Line Items] |  |
Securities sold under agreements to repurchase | 12.4 | 0.0
FHLB of Chicago |  |
Net Investment Income [Line Items] |  |
Fair Value | 1,072.2 | 987.2
Governmental agencies as required by law in various states |  |
Net Investment Income [Line Items] |  |
Fair Value | $ 27.1 | $ 29.2

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