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Balance Sheet Details - Short-term Marketable Securities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt securities, available for sale:
Amortized Cost	$ 1,977.1	$ 1,086.7
Gross Unrealized Gains	2.0	0.5
Gross Unrealized Losses	(0.3)	(0.1)
Estimated Market Value	1,978.8	1,087.1
U.S. government agencies
Debt securities, available for sale:
Amortized Cost	1,598.7	675.6
Gross Unrealized Gains	1.6	0.4
Gross Unrealized Losses	(0.1)	0.0
Estimated Market Value	1,600.2	676.0
Commercial paper
Debt securities, available for sale:
Amortized Cost	295.3	248.1
Gross Unrealized Gains	0.2	0.1
Gross Unrealized Losses	(0.2)	0.0
Estimated Market Value	295.3	248.2
Corporate debt
Debt securities, available for sale:
Amortized Cost	83.1	163.0
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	0.0	(0.1)
Estimated Market Value	$ 83.3	$ 162.9

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