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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	Jun. 30, 2022	Dec. 31, 2021
Amortized cost
Cash and cash equivalents	$ 105.2	$ 258.4
Available-for-sale, Due within one year	100.5
Available-for-sale, Due after one year through five years	80.1
Available-for-sale, Due after five years	0.2
Amortized cost	286.0	398.9
Estimated fair value
Cash and cash equivalents	105.2	258.4
Available-for-sale, Due within one year	99.9
Available-for-sale, Due after one year through five years	78.3
Available-for-sale, Due after five years	0.2
Estimated fair value	283.6	398.8
Cash
Amortized cost
Cash and cash equivalents	81.1	195.2
Estimated fair value
Cash and cash equivalents	81.1	195.2
Cash equivalents
Amortized cost
Cash and cash equivalents	24.1	63.2
Estimated fair value
Cash and cash equivalents	$ 24.1	$ 63.2

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