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MARKETABLE INVESTMENT SECURITIES - Schedule of Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost |  |
Cash and cash equivalents | $ 94.7 |
Available-for-sale: |  |
Due within one year | 4.9 |
Total | 99.6 |
Reclassification to assets held for sale | 2.3 |
Amortized cost | 97.3 | $ 141.0
Estimated fair value |  |
Cash and cash equivalents | 94.7 |
Available-for-sale: |  |
Due within one year | 4.9 |
Total | 99.6 |
Reclassification to assets held for sale | 2.3 |
Estimated fair value | 97.3 | $ 140.9
Cash |  |
Amortized cost |  |
Cash and cash equivalents | 88.3 |
Estimated fair value |  |
Cash and cash equivalents | 88.3 |
Cash equivalents |  |
Amortized cost |  |
Cash and cash equivalents | 6.4 |
Estimated fair value |  |
Cash and cash equivalents | $ 6.4 |

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