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Fair Value and Equity Investments, Equity Investments (Details) - Equity Securities [Member] - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2023 | Dec. 31, 2022
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |
Carrying amount of equity securities without readily determinable fair values |  | $ 28.1 | $ 28.1
Other Expense, Net [Member] |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |
Upward fair value adjustments on equity securities | $ 18.1 |  |

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