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Investments- Carrying Amounts Of Equity Method Limited Partnership Interest (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Net Investment Income [Line Items] |  |
Limited partnership interests | $ 983.7 | $ 712.8
Commercial mortgage loan funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests | 593.6 | 346.8
Private equity funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests | 76.3 | 74.0
Infrastructure equity funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests | 72.0 | 58.3
Real estate equity funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests | 71.3 | 46.3
Infrastructure debt funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests | 60.0 | 62.4
Other funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests | $ 110.5 | $ 125.0

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