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Fair Value Measurements - Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | $ 604.3 | $ 232.8
Short-term investments | 704.6 | 1,110.6
Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 298.1 | 489.5
U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 232.9 | 346.4
Asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 75.8 | 111.6
Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 51.3 | 61.2
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 19.8 | 46.4
Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9.8 | 29.1
U.S. agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9.6 | 17.6
Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 5.7 | 5.6
Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 1.6 | 3.2
Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 500.6 | 139.5
U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 14.7 |
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 2.7 | 3.2
Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.8 |
Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.3 |
Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 519.1 | 142.7
Short-term investments | 704.6 | 1,110.6
Assets, fair value disclosure | 1,223.7 | 1,253.3
Fair Value, Measurements, Recurring | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 298.1 | 489.5
Fair Value, Measurements, Recurring | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 232.9 | 346.4
Fair Value, Measurements, Recurring | Asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 75.8 | 111.6
Fair Value, Measurements, Recurring | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 51.3 | 61.2
Fair Value, Measurements, Recurring | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 19.8 | 46.4
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9.8 | 29.1
Fair Value, Measurements, Recurring | U.S. agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9.6 | 17.6
Fair Value, Measurements, Recurring | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 5.7 | 5.6
Fair Value, Measurements, Recurring | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 1.6 | 3.2
Fair Value, Measurements, Recurring | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 500.6 | 139.5
Fair Value, Measurements, Recurring | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 2.7 | 3.2
Fair Value, Measurements, Recurring | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.8 |
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.3 |
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 500.6 | 139.5
Short-term investments | 0.0 | 0.0
Assets, fair value disclosure | 500.6 | 139.5
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | U.S. agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 500.6 | 139.5
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 18.5 | 3.2
Short-term investments | 704.6 | 1,110.6
Assets, fair value disclosure | 723.1 | 1,113.8
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 298.1 | 489.5
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 232.9 | 346.4
Fair Value, Measurements, Recurring | Level 2 | Asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 75.8 | 111.6
Fair Value, Measurements, Recurring | Level 2 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 51.3 | 61.2
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 19.8 | 46.4
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9.8 | 29.1
Fair Value, Measurements, Recurring | Level 2 | U.S. agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 9.6 | 17.6
Fair Value, Measurements, Recurring | Level 2 | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 5.7 | 5.6
Fair Value, Measurements, Recurring | Level 2 | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 1.6 | 3.2
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 14.7 |
Fair Value, Measurements, Recurring | Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 2.7 | 3.2
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.8 |
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.3 |
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Short-term investments | 0.0 | 0.0
Assets, fair value disclosure | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Asset backed securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. agency obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Foreign government obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Supranational securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 | $ 0.0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash equivalents | $ 0.0 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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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/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 2: 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 3: 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//1943274/2147479853/942-210-S99-1 Reference 4: 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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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