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Investments- Carrying Amounts Of Equity Method Limited Partnership Interest (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Net Investment Income [Line Items] |  |  |
Limited partnership interests | $ 1,138.8 | $ 983.7 | [1]
Commercial mortgage loan funds |  |  |
Net Investment Income [Line Items] |  |  |
Limited partnership interests | 660.8 | 593.6 |
Real estate equity funds |  |  |
Net Investment Income [Line Items] |  |  |
Limited partnership interests | 109.2 | 71.3 |
Private equity funds |  |  |
Net Investment Income [Line Items] |  |  |
Limited partnership interests | 92.7 | 76.3 |
Infrastructure equity funds |  |  |
Net Investment Income [Line Items] |  |  |
Limited partnership interests | 77.2 | 72.0 |
Infrastructure debt funds |  |  |
Net Investment Income [Line Items] |  |  |
Limited partnership interests | 59.1 | 60.0 |
Other funds |  |  |
Net Investment Income [Line Items] |  |  |
Limited partnership interests | $ 139.8 | $ 110.5 |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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