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Balance Sheet Details and Other Financial Information - Short-Term Marketable Securities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities, available-for-sale: |  |
Amortized Cost | $ 1,769.2 | $ 1,972.7
Gross Unrealized Gains | 0.8 | 1.7
Gross Unrealized Losses | (0.7) | (1.1)
Estimated Market Value | 1,769.3 | 1,973.3
U.S. government agencies |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 945.5 | 1,149.4
Gross Unrealized Gains | 0.3 | 1.3
Gross Unrealized Losses | (0.5) | (0.6)
Estimated Market Value | 945.3 | 1,150.1
Commercial paper |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 143.8 | 312.2
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | (0.1)
Estimated Market Value | 143.7 | 312.1
Corporate debt |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 679.9 | 511.1
Gross Unrealized Gains | 0.5 | 0.4
Gross Unrealized Losses | (0.1) | (0.4)
Estimated Market Value | $ 680.3 | $ 511.1

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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