Fair Value and Equity Investments, Equity Investments (Details) - Equity Securities [Member] - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Sep. 30, 2021 |
Jun. 30, 2024 |
Dec. 31, 2023 |
|
| Equity Investments [Abstract] | |||
| Carrying amount of equity securities without readily determinable fair values | $ 28.1 | $ 28.1 | |
| Other Income (Expense), Net [Member] | |||
| Equity Investments [Abstract] | |||
| Upward fair value adjustments on equity securities | $ 18.1 |