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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