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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, 2023
Dec. 31, 2022
Jun. 30, 2022
Amortized cost      
Cash and cash equivalents $ 102.8 $ 56.9 $ 104.2
Available-for-sale, Due within one year 19.0    
Available-for-sale, Due after one year through five years 6.5    
Available-for-sale, Due after five years 0.0    
Amortized cost 128.3 172.4  
Estimated fair value      
Cash and cash equivalents 102.8 56.9  
Available-for-sale, Due within one year 18.8    
Available-for-sale, Due after one year through five years 6.2    
Available-for-sale, Due after five years 0.0    
Estimated fair value 127.8 169.7  
Cash      
Amortized cost      
Cash and cash equivalents 102.2 53.6  
Estimated fair value      
Cash and cash equivalents 102.2 53.6  
Cash equivalents      
Amortized cost      
Cash and cash equivalents 0.6 3.3  
Estimated fair value      
Cash and cash equivalents $ 0.6 $ 3.3