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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions | Sep. 30, 2024 USD ($) Security | Dec. 31, 2023 USD ($) Security
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Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months | $ 10.3 |  | $ 47.8
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security | 15 |  | 60
Unrealized Losses Less Than 12 Months | $ 0.0 | [1] | $ 0.1
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 13.0 |  | $ 43.9
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 15 |  | 61
Unrealized Losses 12 Months Or Longer | $ 0.0 | [1] | $ 0.4
Corporate Debt Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months | $ 8.3 |  | $ 27.9
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security | 12 |  | 35
Unrealized Losses Less Than 12 Months | $ 0.0 | [1] | $ 0.1
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 4.0 |  | $ 36.2
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 7 |  | 49
Unrealized Losses 12 Months Or Longer | $ 0.0 | [1] | $ 0.3
U.S. Treasury Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months | $ 0.0 |  | $ 11.4
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security | 0 |  | 11
Unrealized Losses Less Than 12 Months | $ 0.0 | [1] | $ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 9.0 |  | $ 6.2
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 8 |  | 10
Unrealized Losses 12 Months Or Longer | $ 0.0 | [1] | $ 0.1
U.S. Government Agency Securities |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Fair Value of Marketable Debt Securities in a Loss Position Less Than 12 Months | $ 2.0 |  | $ 8.5
Number of Marketable Debt Securities in a Loss Position Less Than 12 Months | Security | 3 |  | 14
Unrealized Losses Less Than 12 Months | $ 0.0 | [1] | $ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 0.0 |  | $ 1.5
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 0 |  | 2
Unrealized Losses 12 Months Or Longer | $ 0.0 | [1] | $ 0.0
[1] | Unrealized losses were insignificant for both debt securities in a continuous loss position less than 12 months and debt securities in a continuous loss position greater than or equal to 12 months for the period ended September 30, 2024.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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