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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	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Amortized cost
Cash and cash equivalents	$ 53.6	$ 56.9	$ 164.2
Available-for-sale, Due within one year	25.4
Available-for-sale, Due after one year through five years	31.6
Available-for-sale, Due after five years	0.0
Amortized cost	110.6	172.4
Estimated fair value
Cash and cash equivalents	53.6	56.9
Available-for-sale, Due within one year	25.1
Available-for-sale, Due after one year through five years	30.4
Available-for-sale, Due after five years	0.0
Estimated fair value	109.1	169.7
Cash
Amortized cost
Cash and cash equivalents	51.9	53.6
Estimated fair value
Cash and cash equivalents	51.9	53.6
Cash equivalents
Amortized cost
Cash and cash equivalents	1.7	3.3
Estimated fair value
Cash and cash equivalents	$ 1.7	$ 3.3

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