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Balance Sheet Details - Short-term Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt securities, available for sale:
Amortized Cost	$ 1,898.6	$ 1,890.0
Gross Unrealized Gains	0.2	0.2
Gross Unrealized Losses	0.0	(0.1)
Estimated Market Value	1,898.8	1,890.1
U.S. government agencies
Debt securities, available for sale:
Amortized Cost	1,502.0	1,570.4
Gross Unrealized Gains	0.2	0.1
Gross Unrealized Losses	0.0	(0.1)
Estimated Market Value	1,502.2	1,570.4
Commercial paper
Debt securities, available for sale:
Amortized Cost	313.8	258.7
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	0.0	0.0
Estimated Market Value	313.8	258.8
Corporate debt
Debt securities, available for sale:
Amortized Cost	82.8	60.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses		0.0
Estimated Market Value	$ 82.8	$ 60.9

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