XML 55 R45.htm IDEA: XBRL DOCUMENT v3.23.3
MARKETABLE INVESTMENT SECURITIES - Schedule of Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Amortized cost      
Cash and cash equivalents $ 76.0 $ 56.9 $ 108.7
Available-for-sale, Due within one year 10.5    
Amortized cost 86.5 172.4  
Estimated fair value      
Cash and cash equivalents 76.0 56.9  
Available-for-sale, Due within one year 10.3    
Estimated fair value 86.3 169.7  
Cash      
Amortized cost      
Cash and cash equivalents 75.3 53.6  
Estimated fair value      
Cash and cash equivalents 75.3 53.6  
Cash equivalents      
Amortized cost      
Cash and cash equivalents 0.7 3.3  
Estimated fair value      
Cash and cash equivalents $ 0.7 $ 3.3