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Fair Value (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Fair Value Disclosure [Line Items] |  |  |  |
Transfers between Fair Value Hierarchies |  | $ 0.0 | $ 0.0 |
Allowance for Credit Loss | $ 0.3 |  | 0.3 | $ 0.6
Debt Securities, Available-for-Sale, Realized Gain | 0.1 |  | 0.5 |
U.S. Treasury debt securities |  |  |  |
Fair Value Disclosure [Line Items] |  |  |  |
Allowance for Credit Loss | 0.0 |  | 0.0 | 0.0
Corporate/Other debt securities |  |  |  |
Fair Value Disclosure [Line Items] |  |  |  |
Allowance for Credit Loss | $ 0.3 |  | $ 0.3 | $ 0.6

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