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MARKETABLE INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 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 gains, 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 June 30, 2024 and December 31, 2023 were as follows:
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
June 30, 2024 |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 88.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 88.3 |
Cash equivalents | 6.4 |  |  | — |  |  | — |  |  | 6.4 |
Total cash and cash equivalents | 94.7 |  |  | — |  |  | — |  |  | 94.7 |
Reclassification to assets held for sale | (2.3) |  |  | — |  |  | — |  |  | (2.3) |
Total cash and cash equivalents | 92.4 |  | — |  |  | — |  |  | 92.4
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 4.3 |  |  | — |  |  | — |  |  | 4.3 |
Municipal bonds | 0.6 |  |  | — |  |  | — |  |  | 0.6 |
Total | $ | 97.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 97.3 |
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | 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 |
Schedule of Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities | Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities were as follows at June 30, 2024:
(in millions) | Amortized cost |  | Estimated fair value
Cash | $ | 88.3 |  |  | $ | 88.3 |
Cash equivalents | 6.4 |  |  | 6.4 |
Available-for-sale: |  |  |
Due within one year | 4.9 |  |  | 4.9 |
Total | 99.6 |  |  | 99.6 |
Reclassification to assets held for sale | (2.3) |  |  | (2.3) |
Total cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities | $ | 97.3 |  |  | $ | 97.3 |

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