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Cash, Cash Equivalents, and Marketable Debt Securities - Schedule of Marketable Debt Securities in Continuous Loss Position (Details) $ in Millions | Dec. 31, 2023 USD ($) Security | Dec. 31, 2022 USD ($) 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 | $ 47.8 | $ 94.7
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security | 60 | 132
Unrealized Losses Less Than 12 Months | $ 0.1 | $ 1.2
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 43.9 | $ 48.5
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 61 | 66
Unrealized Losses 12 Months Or Longer | $ 0.4 | $ 1.4
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 | $ 27.9 | $ 77.0
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security | 35 | 113
Unrealized Losses Less Than 12 Months | $ 0.1 | $ 1.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 36.2 | $ 37.9
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 49 | 50
Unrealized Losses 12 Months Or Longer | $ 0.3 | $ 1.1
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 | $ 11.4 | $ 14.5
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security | 11 | 14
Unrealized Losses Less Than 12 Months | $ 0.0 | $ 0.2
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 6.2 | $ 9.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 10 | 13
Unrealized Losses 12 Months Or Longer | $ 0.1 | $ 0.3
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 | $ 8.5 | $ 3.2
Number of Marketable Debt Securities in a Loss Position Less than 12 Months | Security | 14 | 5
Unrealized Losses Less Than 12 Months | $ 0.0 | $ 0.0
Fair Value of Marketable Debt Securities in a Loss Position 12 Months Or Longer | $ 1.5 | $ 1.3
Number of Marketable Debt Securities in a Loss Position 12 Months Or Longer | Security | 2 | 3
Unrealized Losses 12 Months Or Longer | $ 0.0 | $ 0.0

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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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