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Investments in Limited Partnerships (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Investments in Limited Partnerships |  |  |
Number of investments in affordable housing partnerships | 19 | 16 |
Investments in affordable housing partnerships carrying value, net | $ 38.4 | $ 25.1 |
Federal affordable housing tax credits | 83.2 |  |
Expected amortization of investments in affordable housing partnerships | 75.0 |  |
Usage of federal affordable housing tax credits | 4.9 | 4.9 | $ 6.6
Actual amortization of investments in affordable housing partnerships | $ 4.4 | $ 4.2 | $ 5.5

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