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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | --- | ---
Amortized cost |  |  |  |
Cash and cash equivalents | $ 56.9 | $ 257.4 | $ 117.0 | $ 163.7
Available-for-sale, Due within one year | 58.8 |  |  |
Available-for-sale, Due after one year through five years | 56.7 |  |  |
Available-for-sale, Due after five years | 0.0 |  |  |
Amortized cost | 172.4 | 397.9 |  |
Estimated fair value |  |  |  |
Cash and cash equivalents | 56.9 | 257.4 |  |
Available-for-sale, Due within one year | 58.0 |  |  |
Available-for-sale, Due after one year through five years | 54.8 |  |  |
Available-for-sale, Due after five years | 0.0 |  |  |
Total, Estimated fair value | 169.7 | 397.8 |  |
Cash |  |  |  |
Amortized cost |  |  |  |
Cash and cash equivalents | 53.6 | 194.2 |  |
Estimated fair value |  |  |  |
Cash and cash equivalents | 53.6 | 194.2 |  |
Cash equivalents |  |  |  |
Amortized cost |  |  |  |
Cash and cash equivalents | 3.3 | 63.2 |  |
Estimated fair value |  |  |  |
Cash and cash equivalents | $ 3.3 | $ 63.2 |  |

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