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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
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Cash and cash equivalents:      
Total cash and cash equivalents $ 94.7    
Total cash and cash equivalents 94.7    
Reclassification to assets held for sale (2.3)    
Reclassification to assets held for sale (2.3)    
Amortized cost 92.4 $ 132.1 $ 102.8
Estimated fair value 92.4 132.1  
Total      
Amortized cost 97.3 141.0  
Gross unrealized holding gains 0.0 0.0  
Gross unrealized holding losses 0.0 (0.1)  
Estimated fair value 97.3 140.9  
Corporate bonds and notes      
Available-for-sale:      
Amortized cost 4.3 8.4  
Gross unrealized holding gains 0.0 0.0  
Gross unrealized holding losses 0.0 (0.1)  
Estimated fair value 4.3 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  
Cash      
Cash and cash equivalents:      
Total cash and cash equivalents 88.3    
Total cash and cash equivalents 88.3    
Amortized cost   129.9  
Estimated fair value   129.9  
Cash equivalents      
Cash and cash equivalents:      
Total cash and cash equivalents 6.4    
Total cash and cash equivalents $ 6.4    
Amortized cost   2.2  
Estimated fair value   $ 2.2