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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 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Cash and cash equivalents | $ 258.4 | $ 117.0
Available-for-sale, Due within one year | 80.3 |
Available-for-sale, Due after one year through five years | 60.2 |
Available-for-sale, Due after five years | 0.0 |
Total, Amortized cost | 398.9 | 170.9
Estimated fair value |  |
Cash and cash equivalents | 258.4 | 117.0
Available-for-sale, Due within one year | 80.4 |
Available-for-sale, Due after one year through five years | 60.0 |
Available-for-sale, Due after five years | 0.0 |
Total, Estimated fair value | 398.8 | 171.7
Cash |  |
Amortized cost |  |
Cash and cash equivalents | 195.2 | 47.9
Estimated fair value |  |
Cash and cash equivalents | 195.2 | 47.9
Cash equivalents |  |
Amortized cost |  |
Cash and cash equivalents | 63.2 | 69.1
Estimated fair value |  |
Cash and cash equivalents | $ 63.2 | $ 69.1

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