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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, 2024
Dec. 31, 2023
Mar. 31, 2023
Amortized cost      
Cash and cash equivalents $ 96.9 $ 132.1 $ 53.6
Available-for-sale, Due within one year 7.5    
Amortized cost 104.4 141.0  
Estimated fair value      
Cash and cash equivalents 96.9 132.1  
Available-for-sale, Due within one year 7.4    
Estimated fair value 104.3 140.9  
Cash      
Amortized cost      
Cash and cash equivalents 93.1 129.9  
Estimated fair value      
Cash and cash equivalents 93.1 129.9  
Cash equivalents      
Amortized cost      
Cash and cash equivalents 3.8 2.2  
Estimated fair value      
Cash and cash equivalents $ 3.8 $ 2.2