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MARKETABLE INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security | The amortized cost, gross unrealized holding losses, and fair value for debt securities classified as available-for-sale securities by major security type and class of security at December 31, 2023 were as follows:
(in millions) | Amortized cost |  |  |  | Gross unrealized holding losses |  | Estimated fair value
December 31, 2023: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 129.9 |  |  |  |  | $ | — |  |  | $ | 129.9 |
Cash equivalents | 2.2 |  |  |  |  | — |  |  | 2.2 |
Total cash and cash equivalents | 132.1 |  |  |  |  | — |  |  | 132.1 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 8.4 |  |  |  |  | (0.1) |  |  | 8.3 |
Municipal bonds | 0.5 |  |  |  |  | — |  |  | 0.5 |
Total | $ | 141.0 |  |  |  |  | $ | (0.1) |  |  | $ | 140.9 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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