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Balance Sheet Details and Other Financial Information - Short-Term Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt securities, available-for-sale:
Amortized Cost	$ 2,047.2	$ 2,157.4
Gross Unrealized Gains	0.4	1.3
Gross Unrealized Losses	(1.8)	(0.9)
Estimated Market Value	2,045.8	2,157.8
U.S. government agencies
Debt securities, available-for-sale:
Amortized Cost	1,432.8	1,611.8
Gross Unrealized Gains	0.3	1.2
Gross Unrealized Losses	(1.2)	(0.5)
Estimated Market Value	1,431.9	1,612.5
Commercial paper
Debt securities, available-for-sale:
Amortized Cost	324.1	184.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.2)	(0.1)
Estimated Market Value	323.9	184.7
Corporate debt
Debt securities, available-for-sale:
Amortized Cost	290.3	360.8
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	(0.4)	(0.3)
Estimated Market Value	$ 290.0	$ 360.6

X

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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