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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
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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Cash equivalents and investments.

+ References

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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

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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))
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