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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, 2021	Dec. 31, 2020
Amortized cost
Cash and cash equivalents	$ 148.9	$ 117.0
Available-for-sale, Due within one year	26.9
Available-for-sale, Due after one year through five years	11.7
Available-for-sale, Due after five years	0.0
Total, Amortized cost	187.5	170.9
Estimated fair value
Cash and cash equivalents	148.9	117.0
Available-for-sale, Due within one year	27.2
Available-for-sale, Due after one year through five years	11.9
Available-for-sale, Due after five years	0.0
Total, Estimated fair value	188.0	171.7
Cash
Amortized cost
Cash and cash equivalents	65.9	47.9
Estimated fair value
Cash and cash equivalents	65.9	47.9
Cash equivalents
Amortized cost
Cash and cash equivalents	83.0	69.1
Estimated fair value
Cash and cash equivalents	$ 83.0	$ 69.1

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