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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 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 June 30, 2024
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Within 1 Year |  |  |  |  |  | After 1 Year through 5 Years |  | After 5 Years
U.S. Treasury | $ | 20.1 |  |  | $ | — |  |  | $ | (0.2) |  |  | $ | 19.9 |  |  | $ | 3.4 |  |  |  |  |  |  | $ | 13.5 |  |  | $ | 3.0 |
Municipal securities | 9.7 |  |  | — |  |  | (0.1) |  |  | 9.6 |  |  | 1.5 |  |  |  |  |  |  | 3.7 |  |  | 4.4 |
Corporate debt | 20.0 |  |  | — |  |  | (0.2) |  |  | 19.8 |  |  | — |  |  |  |  |  |  | 14.6 |  |  | 5.2 |
Total | $ | 49.8 |  |  | $ | — |  |  | $ | (0.5) |  |  | $ | 49.3 |  |  | $ | 4.9 |  |  |  |  |  |  | $ | 31.8 |  |  | $ | 12.6 |

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