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Balance Sheet Details - Short-term Marketable Securities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt securities, available for sale: |  |
Amortized Cost | $ 923.2 | $ 1,086.7
Gross Unrealized Gains | 3.6 | 0.5
Gross Unrealized Losses | (0.9) | (0.1)
Estimated Market Value | 925.9 | 1,087.1
U.S. government agencies |  |
Debt securities, available for sale: |  |
Amortized Cost | 620.4 | 675.6
Gross Unrealized Gains | 3.5 | 0.4
Gross Unrealized Losses | 0.0 | 0.0
Estimated Market Value | 623.9 | 676.0
Commercial paper |  |
Debt securities, available for sale: |  |
Amortized Cost | 189.1 | 248.1
Gross Unrealized Gains | 0.1 | 0.1
Gross Unrealized Losses | (0.1) | 0.0
Estimated Market Value | 189.1 | 248.2
Corporate debt |  |
Debt securities, available for sale: |  |
Amortized Cost | 113.7 | 163.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.8) | (0.1)
Estimated Market Value | $ 112.9 | $ 162.9

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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