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MARKETABLE INVESTMENT SECURITIES - Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Cash and cash equivalents:
Amortized cost	$ 96.9	$ 132.1	$ 53.6
Estimated fair value	96.9	132.1
Total
Amortized cost	104.4	141.0
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.1)	(0.1)
Estimated fair value	104.3	140.9
Corporate bonds and notes
Available-for-sale:
Amortized cost	6.9	8.4
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	(0.1)	(0.1)
Estimated fair value	6.8	8.3
Municipal bonds
Available-for-sale:
Amortized cost	0.6	0.5
Gross unrealized holding gains	0.0	0.0
Gross unrealized holding losses	0.0	0.0
Estimated fair value	0.6	0.5
Federal agency issues
Available-for-sale:
Amortized cost	0.0
Gross unrealized holding gains	0.0
Gross unrealized holding losses	0.0
Estimated fair value	0.0
Cash
Cash and cash equivalents:
Amortized cost	93.1	129.9
Estimated fair value	93.1	129.9
Cash equivalents
Cash and cash equivalents:
Amortized cost	3.8	2.2
Estimated fair value	$ 3.8	$ 2.2

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