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Significant Accounting Policies - Investments (Narrative) (Details) - Fair Value, Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Change in Accounting Estimate [Line Items] |  |
Short-term investments | $ 15.9 | $ 31.6
Level 2 |  |
Change in Accounting Estimate [Line Items] |  |
Short-term investments | $ 15.9 | $ 31.6

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