Investments in Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Investment in biotechnology companies that are determined to be unconsolidated variable interest entities	$ 22.8	$ 16.4
Neurimmune
Variable Interest Entity [Line Items]
Research and development costs, percentage	100.00%
Deconsolidation, gain (loss), amount	$ 3.0