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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - Recurring Basis - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Assets | $ 27.9 | $ 91.9
Certificate of deposit |  |
Assets: |  |
Certificate of deposit | 2.2 | 2.1
Money Market Funds |  |
Assets: |  |
Cash and cash equivalents—money market funds | 25.7 | 89.8
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Assets | 25.7 | 89.8
Quoted Prices in Active Markets (Level 1) | Certificate of deposit |  |
Assets: |  |
Certificate of deposit | 0.0 | 0.0
Quoted Prices in Active Markets (Level 1) | Money Market Funds |  |
Assets: |  |
Cash and cash equivalents—money market funds | 25.7 | 89.8
Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets | 2.2 | 2.1
Other Observable Inputs (Level 2) | Certificate of deposit |  |
Assets: |  |
Certificate of deposit | 2.2 | 2.1
Other Observable Inputs (Level 2) | Money Market Funds |  |
Assets: |  |
Cash and cash equivalents—money market funds | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Certificate of deposit |  |
Assets: |  |
Certificate of deposit | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Money Market Funds |  |
Assets: |  |
Cash and cash equivalents—money market funds | $ 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). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 10: 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 + Details
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