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Balance Sheet Details and Other Financial Information - Short-Term Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt securities, available-for-sale:
Amortized Cost	$ 1,867.7	$ 2,157.4
Gross Unrealized Gains	3.8	1.3
Gross Unrealized Losses	(0.4)	(0.9)
Estimated Market Value	1,871.1	2,157.8
U.S. government agencies
Debt securities, available-for-sale:
Amortized Cost	1,035.4	1,611.8
Gross Unrealized Gains	2.8	1.2
Gross Unrealized Losses	(0.1)	(0.5)
Estimated Market Value	1,038.1	1,612.5
Commercial paper
Debt securities, available-for-sale:
Amortized Cost	391.3	184.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	(0.1)
Estimated Market Value	391.1	184.7
Corporate debt
Debt securities, available-for-sale:
Amortized Cost	441.0	360.8
Gross Unrealized Gains	1.0	0.1
Gross Unrealized Losses	(0.1)	(0.3)
Estimated Market Value	$ 441.9	$ 360.6

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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