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Investments- Carrying Amounts Of Equity Method Limited Partnership Interest (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Net Investment Income |  |
Limited partnership interests | $ 712.8 | $ 449.0
Commercial mortgage loan funds |  |
Net Investment Income |  |
Limited partnership interests | 346.8 | 149.6
Private equity funds |  |
Net Investment Income |  |
Limited partnership interests | 74.0 | 39.6
Infrastructure debt funds |  |
Net Investment Income |  |
Limited partnership interests | 62.4 | 58.3
Infrastructure equity funds |  |
Net Investment Income |  |
Limited partnership interests | 58.3 | 52.1
Other funds |  |
Net Investment Income |  |
Limited partnership interests | $ 171.3 | $ 149.4

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