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Marketable Investment Securities - Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Cash and cash equivalents:    
Cash and cash equivalents, Amortized cost $ 118.3 $ 163.7
Cash and cash equivalents, Estimated fair value 118.3 163.7
Total:    
Total, Amortized cost 189.6 253.5
Total, Gross unrealized holding gains 1.0 1.3
Total, Gross unrealized holding losses 0.0 0.0
Total, Estimated fair value 190.6 254.8
Cash    
Cash and cash equivalents:    
Cash and cash equivalents, Amortized cost 68.3 132.8
Cash and cash equivalents, Estimated fair value 68.3 132.8
Cash equivalents    
Cash and cash equivalents:    
Cash and cash equivalents, Amortized cost 50.0 30.9
Cash and cash equivalents, Estimated fair value 50.0 30.9
Corporate bonds and notes    
Available-for-sale:    
Available-for-sale, Amortized cost 40.5 50.1
Available-for-sale, Gross unrealized holding gains 0.6 0.8
Available-for-sale, Gross unrealized holding losses 0.0 0.0
Available-for-sale, Estimated fair value 41.1 50.9
Municipal bonds    
Available-for-sale:    
Available-for-sale, Amortized cost 12.6 17.8
Available-for-sale, Gross unrealized holding gains 0.2 0.2
Available-for-sale, Gross unrealized holding losses 0.0 0.0
Available-for-sale, Estimated fair value 12.8 18.0
Federal agency issues    
Available-for-sale:    
Available-for-sale, Amortized cost 4.0 5.5
Available-for-sale, Gross unrealized holding gains 0.1 0.1
Available-for-sale, Gross unrealized holding losses 0.0 0.0
Available-for-sale, Estimated fair value 4.1 5.6
US government securities    
Available-for-sale:    
Available-for-sale, Amortized cost 14.2 16.4
Available-for-sale, Gross unrealized holding gains 0.1 0.2
Available-for-sale, Gross unrealized holding losses 0.0 0.0
Available-for-sale, Estimated fair value $ 14.3 $ 16.6