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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, 2022	Dec. 31, 2021
Amortized cost
Cash and cash equivalents	$ 110.7	$ 258.4
Available-for-sale, Due within one year	83.4
Available-for-sale, Due after one year through five years	68.3
Available-for-sale, Due after five years	0.0
Amortized cost	262.4	398.9
Estimated fair value
Cash and cash equivalents	110.7	258.4
Available-for-sale, Due within one year	82.5
Available-for-sale, Due after one year through five years	66.0
Available-for-sale, Due after five years	0.0
Estimated fair value	259.2	398.8
Cash
Amortized cost
Cash and cash equivalents	57.8	195.2
Estimated fair value
Cash and cash equivalents	57.8	195.2
Cash equivalents
Amortized cost
Cash and cash equivalents	52.9	63.2
Estimated fair value
Cash and cash equivalents	$ 52.9	$ 63.2

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