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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Available-for-Sale | A summary of our debt securities as of September 30, 2025 is as follows (in millions):
| Amortized Cost |  | Gross Unrealized Gains |  |  |  | Fair Value
Available-for-sale debt securities: |  |  |  |  |  |  |
U.S. government and agency securities | $ | 44.6 |  |  | $ | 0.2 |  |  |  |  | $ | 44.8 |
Corporate bonds and notes | 58.9 |  |  | 0.4 |  |  |  |  | 59.3 |
Investing information related to our available-for-sale debt securities is as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Proceeds from sales and maturities | $ | 16.3 |  |  | $ | — |  |  | $ | 25.0 |  |  | $ | — |
The contractual maturities of our available-for-sale debt securities as of September 30, 2025 are as follows (in millions):
| Amortized Cost |  | Fair Value
Due in one year or less | $ | 23.9 |  |  | $ | 23.9 |
Due after one year through five years | 69.5 |  |  | 69.9 |
Due after five years through ten years | 4.7 |  |  | 4.8 |
Due after ten years | 5.4 |  |  | 5.5 |
Total | $ | 103.5 |  |  | $ | 104.1 |

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