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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Marketable Debt Securities | Marketable debt securities accounted for as AFS, and recorded within Other current assets in the Consolidated Balance Sheets, were as follows:
| As of June 30, 2025
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(In millions) | Amortized Cost |  | Total Net Gains 1 |  | Total Net Losses 1 |  | Fair Value |  | Within 1 Year |  | After 1 Year through 5 Years |  | After 5 Years
U.S. Treasury | $18.5 |  | $0.1 |  | $— |  | $18.6 |  | $3.6 |  | $11.6 |  | $3.4
Municipal securities | 8.6 |  | 0.1 |  | — |  | 8.7 |  | — |  | 7.4 |  | 1.3
Corporate debt | 22.3 |  | 0.2 |  | — |  | 22.5 |  | 4.4 |  | 13.4 |  | 4.7
Total | $49.4 |  | $0.4 |  | $— |  | $49.8 |  | $8.0 |  | $32.4 |  | $9.4
| As of December 31, 2024
|  |  |  |  |  |  |  |  | Fair Value of Securities with Contractual Maturities
(In millions) | Amortized Cost |  | Total Net Gains 1 |  | Total Net 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 gains (losses) for securities with net gains (losses) in accumulated other comprehensive income.

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