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Balance Sheet Details and Other Financial Information - Short-Term Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt securities, available-for-sale:
Amortized Cost	$ 1,794.6	$ 1,972.7
Gross Unrealized Gains	1.2	1.7
Gross Unrealized Losses	(0.6)	(1.1)
Estimated Market Value	1,795.2	1,973.3
U.S. government agencies
Debt securities, available-for-sale:
Amortized Cost	1,054.4	1,149.4
Gross Unrealized Gains	0.7	1.3
Gross Unrealized Losses	(0.4)	(0.6)
Estimated Market Value	1,054.7	1,150.1
Commercial paper
Debt securities, available-for-sale:
Amortized Cost	231.4	312.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Market Value	231.3	312.1
Corporate debt
Debt securities, available-for-sale:
Amortized Cost	508.8	511.1
Gross Unrealized Gains	0.5	0.4
Gross Unrealized Losses	(0.1)	(0.4)
Estimated Market Value	$ 509.2	$ 511.1

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