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Balance Sheet Details and Other Financial Information - Short-Term Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt securities, available-for-sale:
Amortized Cost	$ 1,484.8	$ 1,972.7
Gross Unrealized Gains	1.8	1.7
Gross Unrealized Losses	(0.2)	(1.1)
Estimated Market Value	1,486.4	1,973.3
U.S. government agencies
Debt securities, available-for-sale:
Amortized Cost	648.0	1,149.4
Gross Unrealized Gains	0.7	1.3
Gross Unrealized Losses	(0.1)	(0.6)
Estimated Market Value	648.6	1,150.1
Commercial paper
Debt securities, available-for-sale:
Amortized Cost	172.3	312.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Estimated Market Value	172.2	312.1
Corporate debt
Debt securities, available-for-sale:
Amortized Cost	664.5	511.1
Gross Unrealized Gains	1.1	0.4
Gross Unrealized Losses	0.0	(0.4)
Estimated Market Value	$ 665.6	$ 511.1

X

- 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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of 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 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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