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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Debt Securities | Marketable debt securities accounted for as AFS were as follows:
| As of September 30, 2024
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(in millions) | Amortized Cost |  | Total Gains 1 |  | Total Losses 1 |  | Fair Value |  | Within 1 Year |  |  |  |  |  | After 1 Year through 5 Years |  | After 5 Years
U.S. Treasury | $ | 20.2 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 20.5 |  |  | $ | 3.4 |  |  |  |  |  |  | $ | 13.9 |  |  | $ | 3.2 |
Municipal securities | 10.0 |  |  | 0.2 |  |  | — |  |  | 10.2 |  |  | 1.5 |  |  |  |  |  |  | 3.8 |  |  | 4.9 |
Corporate debt | 20.6 |  |  | 0.4 |  |  | — |  |  | 21.0 |  |  | 1.9 |  |  |  |  |  |  | 14.1 |  |  | 5.0 |
Total | $ | 50.8 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 51.7 |  |  | $ | 6.8 |  |  |  |  |  |  | $ | 31.8 |  |  | $ | 13.1 |
1 Represents total unrealized gains (losses) for securities with net gains (losses) in accumulated other comprehensive income as of September 30, 2024.

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