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Marketable Investment Securities - Narrative (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) position | Dec. 31, 2021 USD ($) position | Jun. 30, 2020 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Investment sold | $ 1.6 | $ 28.4 | $ 8.3 | $ 3.4
Debt securities, available-for-sale, in unrealized loss position | position |  | 118 | 100 |
Debt securities, available-for-sale, unrealized loss position, accumulated loss |  | $ (2.7) | $ (0.2) |
Available-for-sale securities, gross unrealized loss, fair market value |  | $ 111.6 | $ 77.7 |

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