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Investments - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Investment grade rating | 96.00% |  |
Fair Value | $ 5,235.3 | $ 5,185.0 | [1]
FHLB funding agreements | 904.5 | 792.5 |
FHLB of Chicago |  |  |
Net Investment Income [Line Items] |  |  |
Fair Value | 987.2 | 860.4 |
Governmental agencies as required by law in various states |  |  |
Net Investment Income [Line Items] |  |  |
Fair Value | $ 29.2 | $ 28.6 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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