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Balance Sheet Details and Other Financial Information - Short-Term Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities, available-for-sale: |  |
Amortized Cost | $ 2,184.0 | $ 2,157.4
Gross Unrealized Gains | 0.1 | 1.3
Gross Unrealized Losses | (2.6) | (0.9)
Estimated Market Value | 2,181.5 | 2,157.8
U.S. government agencies |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 1,234.8 | 1,611.8
Gross Unrealized Gains | 0.1 | 1.2
Gross Unrealized Losses | (1.6) | (0.5)
Estimated Market Value | 1,233.3 | 1,612.5
Commercial paper |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 497.5 | 184.8
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.2) | (0.1)
Estimated Market Value | 497.3 | 184.7
Corporate debt |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 451.7 | 360.8
Gross Unrealized Gains | 0.0 | 0.1
Gross Unrealized Losses | (0.8) | (0.3)
Estimated Market Value | $ 450.9 | $ 360.6

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