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Balance Sheet Details and Other Financial Information - Schedule of Short-Term Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Amortized Cost	$ 2,157.4	$ 1,819.0
Gross Unrealized Gains	1.3	0.2
Gross Unrealized Losses	(0.9)	(5.3)
Estimated Market Value	2,157.8	1,813.9
U.S. government agencies
Condensed Financial Statements, Captions [Line Items]
Amortized Cost	1,611.8	1,535.1
Gross Unrealized Gains	1.2	0.2
Gross Unrealized Losses	(0.5)	(4.6)
Estimated Market Value	1,612.5	1,530.7
Commercial paper
Condensed Financial Statements, Captions [Line Items]
Amortized Cost	184.8	119.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.2)
Estimated Market Value	184.7	119.4
Corporate debt
Condensed Financial Statements, Captions [Line Items]
Amortized Cost	360.8	164.3
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(0.3)	(0.5)
Estimated Market Value	$ 360.6	$ 163.8

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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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