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Investments- Carrying Amounts Of Equity Method Limited Partnership Interest (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | $ 1,121.3 | $ 1,138.8
Commercial mortgage loan funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | 596.0 | 660.8
Real estate equity funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | 144.7 | 109.2
Private equity funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | 102.2 | 92.7
Infrastructure equity funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | 81.7 | 77.2
Infrastructure debt funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | 69.0 | 59.1
Other funds |  |
Net Investment Income [Line Items] |  |
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) | $ 127.7 | $ 139.8

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