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Equity and Other Investments and Fair Value Measurements - Convertible Promissory Note in Gate Neuroscience (Details) - Gate Neuroscience [Member] - USD ($) $ in Millions		3 Months Ended
	Mar. 03, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Convertible Promissory Note Purchase Agreement
Equity Investment
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Debt instrument maturity date	Nov. 24, 2026
Convertible notes face value	$ 15.0			$ 51.5
Gate 2025 Convertible Note
Equity Investment
Equity and long-term investments at fair value		$ 15.2
Unrealized gain from fair value changes in equity investments		0.2
Gate 2021 Convertible Note
Equity Investment
Equity and long-term investments at fair value		70.0		$ 50.9
Unrealized gain from fair value changes in equity investments		$ 19.1
Unrealized loss from fair value changes in equity investments			$ 0.6