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Balance Sheet Details - Short-term Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt securities, available for sale:
Amortized Cost	$ 1,253.8	$ 1,890.0
Gross Unrealized Gains	0.0	0.2
Gross Unrealized Losses	(0.2)	(0.1)
Estimated Market Value	1,253.6	1,890.1
U.S. government agencies
Debt securities, available for sale:
Amortized Cost	898.9	1,570.4
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Market Value	898.8	1,570.4
Commercial paper
Debt securities, available for sale:
Amortized Cost	254.8	258.7
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	0.0	0.0
Estimated Market Value	254.8	258.8
Corporate debt
Debt securities, available for sale:
Amortized Cost	100.1	60.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Estimated Market Value	$ 100.0	$ 60.9

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