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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	Mar. 31, 2022	Dec. 31, 2021
Amortized cost
Cash and cash equivalents	$ 165.2	$ 258.4
Available-for-sale, Due within one year	103.4
Available-for-sale, Due after one year through five years	72.3
Available-for-sale, Due after five years	0.0
Total, Amortized cost	340.9	398.9
Estimated fair value
Cash and cash equivalents	165.2	258.4
Available-for-sale, Due within one year	103.2
Available-for-sale, Due after one year through five years	70.8
Available-for-sale, Due after five years	0.0
Total, Estimated fair value	339.2	398.8
Cash
Amortized cost
Cash and cash equivalents	138.0	195.2
Estimated fair value
Cash and cash equivalents	138.0	195.2
Cash equivalents
Amortized cost
Cash and cash equivalents	27.2	63.2
Estimated fair value
Cash and cash equivalents	$ 27.2	$ 63.2

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