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Balance Sheet Details - Short-term Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt securities, available for sale:
Amortized Cost	$ 1,929.6	$ 1,086.7
Gross Unrealized Gains	0.8	0.5
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Market Value	1,930.3	1,087.1
U.S. government agencies
Debt securities, available for sale:
Amortized Cost	1,549.1	675.6
Gross Unrealized Gains	0.5	0.4
Gross Unrealized Losses	0.0	0.0
Estimated Market Value	1,549.6	676.0
Commercial paper
Debt securities, available for sale:
Amortized Cost	290.5	248.1
Gross Unrealized Gains	0.2	0.1
Gross Unrealized Losses	0.0	0.0
Estimated Market Value	290.7	248.2
Corporate debt
Debt securities, available for sale:
Amortized Cost	90.0	163.0
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Market Value	$ 90.0	$ 162.9

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