A summary of our debt securities as of September 30, 2026 is as follows (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | | Available-for-sale debt securities: | | | | | | | | | U.S. government and agency securities | $ | 34.1 | | | $ | — | | | $ | (1.1) | | | $ | 33.0 | | | Corporate bonds and notes | 93.6 | | | — | | | (1.9) | | | 91.7 | |
A summary of our debt securities as of December 31, 2025 is as follows (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | | Available-for-sale debt securities: | | | | | | | | | U.S. government and agency securities | $ | 40.2 | | | $ | 0.2 | | | $ | — | | | $ | 40.4 | | | Corporate bonds and notes | 68.7 | | | 0.5 | | | (0.1) | | | 69.1 | |
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, | | 2026 | | 2025 | | 2026 | | 2025 | | Proceeds from sales and maturities | $ | 14.5 | | | $ | 16.3 | | | $ | 35.6 | | | $ | 25.0 | |
The contractual maturities of our available-for-sale debt securities as of September 30, 2026 are as follows (in millions): | | | | | | | | | | | | | Amortized Cost | | Fair Value | | Due in one year or less | $ | 24.0 | | | $ | 24.0 | | | Due after one year through five years | 88.1 | | | 86.5 | | | Due after five years through ten years | 7.2 | | | 6.7 | | | Due after ten years | 8.4 | | | 7.5 | | | Total | $ | 127.7 | | | $ | 124.7 | |
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