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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, 2021	Dec. 31, 2020
Amortized cost
Cash and cash equivalents	$ 118.4	$ 117.0
Available-for-sale, Due within one year	45.8
Available-for-sale, Due after one year through five years	19.7
Available-for-sale, Due after five years	0.0
Total, Amortized cost	183.9	170.9
Estimated fair value
Cash and cash equivalents	118.4	117.0
Available-for-sale, Due within one year	46.0
Available-for-sale, Due after one year through five years	19.9
Available-for-sale, Due after five years	0.0
Total, Estimated fair value	184.3	171.7
Cash
Amortized cost
Cash and cash equivalents	60.4	47.9
Estimated fair value
Cash and cash equivalents	60.4	47.9
Cash equivalents
Amortized cost
Cash and cash equivalents	58.0	69.1
Estimated fair value
Cash and cash equivalents	$ 58.0	$ 69.1

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