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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, 2021	Dec. 31, 2020
Amortized cost
Cash and cash equivalents	$ 295.2	$ 117.0
Available-for-sale, Due within one year	70.7
Available-for-sale, Due after one year through five years	47.5
Available-for-sale, Due after five years	0.0
Total, Amortized cost	413.4	170.9
Estimated fair value
Cash and cash equivalents	295.2	117.0
Available-for-sale, Due within one year	70.9
Available-for-sale, Due after one year through five years	47.5
Available-for-sale, Due after five years	0.0
Total, Estimated fair value	413.6	171.7
Cash
Amortized cost
Cash and cash equivalents	208.8	47.9
Estimated fair value
Cash and cash equivalents	208.8	47.9
Cash equivalents
Amortized cost
Cash and cash equivalents	86.4	69.1
Estimated fair value
Cash and cash equivalents	$ 86.4	$ 69.1

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