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Investments - Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Amortized Cost |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | $ 122.4 | $ 154.9
Less: cash equivalents | (58.6) | (51.8)
Total Investments | 63.8 | 103.1
Amortized Cost | Commercial Bonds and Paper | Fair Value, Inputs, Level 2 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 43.3 | 66.8
Amortized Cost | Money Market Funds | Fair Value, Inputs, Level 1 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 69.6 | 51.8
Amortized Cost | U.S. Treasuries | Fair Value, Inputs, Level 2 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 9.5 | 36.3
Gross Unrealized Holding Gains (Losses) |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 0.2 | (1.2)
Total Investments | 0.2 | (1.2)
Gross Unrealized Holding Gains (Losses) | Commercial Bonds and Paper | Fair Value, Inputs, Level 2 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 0.1 | (0.6)
Gross Unrealized Holding Gains (Losses) | U.S. Treasuries | Fair Value, Inputs, Level 2 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 0.1 | (0.6)
Estimated Fair Value |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 122.6 | 153.7
Less: cash equivalents | (58.6) | (51.8)
Total Investments | 64.0 | 101.9
Estimated Fair Value | Commercial Bonds and Paper | Fair Value, Inputs, Level 2 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 43.4 | 66.2
Estimated Fair Value | Money Market Funds | Fair Value, Inputs, Level 1 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | 69.6 | 51.8
Estimated Fair Value | U.S. Treasuries | Fair Value, Inputs, Level 2 |  |
Schedule of Investments [Line Items] |  |
Total cash equivalents and investments | $ 9.6 | $ 35.7

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- Definition Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Line items represent financial concepts included in a table. 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