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Investments - Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Amortized Cost (Carrying Value) |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | $ 167.9 | $ 160.4
Less cash equivalents | (44.4) | (23.8)
Total Investments | 123.5 | 136.6
Gross Unrealized Holding Losses |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 1.7 | 0.3
Total Investments | 1.7 | 0.3
Estimated Fair Value |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 166.2 | 160.1
Less cash equivalents | (44.4) | (23.8)
Total Investments | 121.8 | 136.3
Commercial Bonds and Paper | Amortized Cost (Carrying Value) | Fair Value, Inputs, Level 2 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 81.7 | 115.2
Commercial Bonds and Paper | Gross Unrealized Holding Losses | Fair Value, Inputs, Level 2 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 0.9 | 0.2
Commercial Bonds and Paper | Estimated Fair Value | Fair Value, Inputs, Level 2 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 80.8 | 115.0
Money Market Funds | Amortized Cost (Carrying Value) | Fair Value, Inputs, Level 1 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 43.4 | 21.3
Money Market Funds | Estimated Fair Value | Fair Value, Inputs, Level 1 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 43.4 | 21.3
U.S. Treasuries | Amortized Cost (Carrying Value) | Fair Value, Inputs, Level 2 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 42.8 | 23.9
U.S. Treasuries | Gross Unrealized Holding Losses | Fair Value, Inputs, Level 2 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | 0.8 | 0.1
U.S. Treasuries | Estimated Fair Value | Fair Value, Inputs, Level 2 |  |
Schedule Of Investments [Line Items] |  |
Total cash equivalents and investments | $ 42.0 | $ 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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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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