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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	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Amortized cost
Cash and cash equivalents	$ 117.0	$ 163.7	$ 93.2
Available-for-sale, Due within one year	33.5
Available-for-sale, Due after one year through five years	20.4
Available-for-sale, Due after five years	0.0
Total, Amortized cost	170.9	253.5	191.2
Estimated fair value
Cash and cash equivalents	117.0	163.7	93.2
Available-for-sale, Due within one year	33.7
Available-for-sale, Due after one year through five years	21.0
Available-for-sale, Due after five years	0.0
Total, Estimated fair value	171.7	254.8	191.8
Cash
Amortized cost
Cash and cash equivalents	47.9	132.8	68.7
Estimated fair value
Cash and cash equivalents	47.9	132.8	68.7
Cash equivalents
Amortized cost
Cash and cash equivalents	69.1	30.9	24.5
Estimated fair value
Cash and cash equivalents	$ 69.1	$ 30.9	$ 24.5

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