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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, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Amortized cost
Cash and cash equivalents	$ 56.9	$ 257.4	$ 117.0	$ 163.7
Available-for-sale, Due within one year	58.8
Available-for-sale, Due after one year through five years	56.7
Available-for-sale, Due after five years	0.0
Amortized cost	172.4	397.9
Estimated fair value
Cash and cash equivalents	56.9	257.4
Available-for-sale, Due within one year	58.0
Available-for-sale, Due after one year through five years	54.8
Available-for-sale, Due after five years	0.0
Total, Estimated fair value	169.7	397.8
Cash
Amortized cost
Cash and cash equivalents	53.6	194.2
Estimated fair value
Cash and cash equivalents	53.6	194.2
Cash equivalents
Amortized cost
Cash and cash equivalents	3.3	63.2
Estimated fair value
Cash and cash equivalents	$ 3.3	$ 63.2

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