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Marketable Investment Securities - Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Amortized cost    
Cash and cash equivalents $ 118.3 $ 163.7
Available-for-sale, Due within one year 41.8  
Available-for-sale, Due after one year through five years 29.5  
Available-for-sale, Due after five years 0.0  
Total, Amortized cost 189.6 253.5
Estimated fair value    
Cash and cash equivalents 118.3 163.7
Available-for-sale, Due within one year 42.1  
Available-for-sale, Due after one year through five years 30.2  
Available-for-sale, Due after five years 0.0  
Total, Estimated fair value 190.6 254.8
Cash    
Amortized cost    
Cash and cash equivalents 68.3 132.8
Estimated fair value    
Cash and cash equivalents 68.3 132.8
Cash equivalents    
Amortized cost    
Cash and cash equivalents 50.0 30.9
Estimated fair value    
Cash and cash equivalents $ 50.0 $ 30.9