Cash, Cash Equivalents and Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Cash and Cash Equivalents [Abstract]
Debt securities in continuous loss position	$ 159.7		$ 159.7		$ 420.4
Securities in unrealized loss position for 12 months or longer					138.8
Continuous unrealized loss position of available-for-sale investments, gross unrealized losses					$ 0.3
Marketable securities, unrealized gain	$ 44.0	$ 4.1	$ 73.6	$ 29.6