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Investments - Schedule of Fair Value of Assets and Financing Liability on Total Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Amortized Cost |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | $ 154.9 | $ 160.4
Less cash equivalents | (51.8) | (23.8)
Total Investments | 103.1 | 136.6
Amortized Cost | Commercial Bonds and Paper | Fair Value, Inputs, Level 2 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 66.8 | 115.2
Amortized Cost | Money Market Funds | Fair Value, Inputs, Level 1 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 51.8 | 21.3
Amortized Cost | U.S. Treasuries | Fair Value, Inputs, Level 2 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 36.3 | 23.9
Gross Unrealized Holding Losses |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 1.2 | 0.3
Total Investments | 1.2 | 0.3
Gross Unrealized Holding Losses | Commercial Bonds and Paper | Fair Value, Inputs, Level 2 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 0.6 | 0.2
Gross Unrealized Holding Losses | U.S. Treasuries | Fair Value, Inputs, Level 2 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 0.6 | 0.1
Estimated Fair Value |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 153.7 | 160.1
Less cash equivalents | (51.8) | (23.8)
Total Investments | 101.9 | 136.3
Estimated Fair Value | Commercial Bonds and Paper | Fair Value, Inputs, Level 2 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 66.2 | 115.0
Estimated Fair Value | Money Market Funds | Fair Value, Inputs, Level 1 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | 51.8 | 21.3
Estimated Fair Value | U.S. Treasuries | Fair Value, Inputs, Level 2 |  |
Fair Value Of Financial Instruments [Line Items] |  |
Total cash equivalents and investments | $ 35.7 | $ 23.8

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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