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Investments in Limited Partnerships (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Investments in Limited Partnerships |  |  |
Number of investments in affordable housing partnerships | 22 | 19 |
Investments in affordable housing partnerships carrying value, net | $ 66.3 | $ 38.4 |
Federal affordable housing tax credits | 75.9 |  |
Expected amortization of investments in affordable housing partnerships | 68.9 |  |
Usage of federal affordable housing tax credits | 7.7 | 4.9 | $ 4.9
Actual amortization of investments in affordable housing partnerships | $ 7.2 | $ 4.4 | $ 4.2

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