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Fair Value and Equity Investments, Equity Investments (Details) - Equity Securities [Member] - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2021
Mar. 31, 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