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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 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Amortized cost |  |  |
Cash and cash equivalents | $ 132.1 | $ 56.9 | $ 257.4
Available-for-sale, Due within one year | 8.9 |  |
Amortized cost | 141.0 | 172.4 |
Estimated fair value |  |  |
Cash and cash equivalents | 132.1 | 56.9 |
Available-for-sale, Due within one year | 8.8 |  |
Total, Estimated fair value | 140.9 | 169.7 |
Cash |  |  |
Amortized cost |  |  |
Cash and cash equivalents | 129.9 | 53.6 |
Estimated fair value |  |  |
Cash and cash equivalents | 129.9 | 53.6 |
Cash equivalents |  |  |
Amortized cost |  |  |
Cash and cash equivalents | 2.2 | 3.3 |
Estimated fair value |  |  |
Cash and cash equivalents | $ 2.2 | $ 3.3 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480832/942-320-50-3A + Details
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