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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, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost |  |
Cash and cash equivalents | $ 105.2 | $ 258.4
Available-for-sale, Due within one year | 100.5 |
Available-for-sale, Due after one year through five years | 80.1 |
Available-for-sale, Due after five years | 0.2 |
Amortized cost | 286.0 | 398.9
Estimated fair value |  |
Cash and cash equivalents | 105.2 | 258.4
Available-for-sale, Due within one year | 99.9 |
Available-for-sale, Due after one year through five years | 78.3 |
Available-for-sale, Due after five years | 0.2 |
Estimated fair value | 283.6 | 398.8
Cash |  |
Amortized cost |  |
Cash and cash equivalents | 81.1 | 195.2
Estimated fair value |  |
Cash and cash equivalents | 81.1 | 195.2
Cash equivalents |  |
Amortized cost |  |
Cash and cash equivalents | 24.1 | 63.2
Estimated fair value |  |
Cash and cash equivalents | $ 24.1 | $ 63.2

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