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Investments (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized cost of held-to-maturity securities | $ 5.2 | $ 4.4
Level 1 |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Fair market value of held-to-maturity securities |  | $ 4.3

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