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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Schedule of Investments [Line Items] |  |
Securities sold under agreements to repurchase | $ 50.0 | $ 0.0
Reverse repurchase agreement, cash to value percentage | 95.00% |
Investment grade rating | 95.90% |
Fair Value | $ 5,342.7 | 5,235.3
FHLB funding agreements | 929.5 | 904.5
Fair Value |  |
Schedule of Investments [Line Items] |  |
Securities sold under agreements to repurchase | 51.8 | 0.0
FHLB of Chicago |  |
Schedule of Investments [Line Items] |  |
Fair Value | 1,014.4 | 987.2
Governmental Agencies as Required by Law in Various States |  |
Schedule of Investments [Line Items] |  |
Fair Value | $ 27.0 | $ 29.2

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