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Balance Sheet Details - Short-Term Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt securities, available-for-sale:
Amortized Cost	$ 1,944.0	$ 1,819.0
Gross Unrealized Gains	1.2	0.2
Gross Unrealized Losses	(1.4)	(5.3)
Estimated Market Value	1,943.8	1,813.9
U.S. government agencies
Debt securities, available-for-sale:
Amortized Cost	1,554.8	1,535.1
Gross Unrealized Gains	1.0	0.2
Gross Unrealized Losses	(1.0)	(4.6)
Estimated Market Value	1,554.8	1,530.7
Commercial paper
Debt securities, available-for-sale:
Amortized Cost	147.1	119.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.2)
Estimated Market Value	147.0	119.4
Corporate debt
Debt securities, available-for-sale:
Amortized Cost	242.1	164.3
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	(0.3)	(0.5)
Estimated Market Value	$ 242.0	$ 163.8

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).

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