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Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Debt Securities | Marketable debt securities accounted for as AFS were as follows:
| As of As of December 31, 2024
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(in millions) | Amortized Cost |  | Gross Gains 1 |  | Gross Losses 1 |  | Fair Value |  | Within 1 Year |  |  |  |  |  | After 1 Year through 5 Years |  | After 5 Years
U.S. Treasury | $ | 20.4 |  |  | $ | — |  |  | $ | (0.2) |  |  | $ | 20.2 |  |  | $ | 3.4 |  |  |  |  |  |  | $ | 13.8 |  |  | $ | 3.1 |
Municipal securities | 10.0 |  |  | — |  |  | — |  |  | 10.0 |  |  | 1.5 |  |  |  |  |  |  | 7.0 |  |  | 1.5 |
Corporate debt | 21.0 |  |  | — |  |  | (0.1) |  |  | 20.9 |  |  | 4.2 |  |  |  |  |  |  | 13.7 |  |  | 2.9 |
Total | $ | 51.4 |  |  | $ | — |  |  | $ | (0.3) |  |  | $ | 51.1 |  |  | $ | 9.1 |  |  |  |  |  |  | $ | 34.5 |  |  | $ | 7.5 |
(1)Represents total unrealized losses for securities with net losses in accumulated other comprehensive income as of December 31, 2024.

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