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Investments - Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost (Carrying Value)
Schedule Of Investments [Line Items]
Total cash equivalents and investments	$ 219.5	$ 160.4
Less cash equivalents	(53.8)	(23.8)
Total Investments	165.7	136.6
Gross Unrealized Holding Losses
Schedule Of Investments [Line Items]
Total cash equivalents and investments	1.3	0.3
Total Investments	1.3	0.3
Estimated Fair Value
Schedule Of Investments [Line Items]
Total cash equivalents and investments	218.3	160.1
Less cash equivalents	(53.8)	(23.8)
Total Investments	164.5	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	119.5	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	0.8	0.2
Commercial Bonds and Paper | Estimated Fair Value | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	118.8	115.0
Money Market Funds | Amortized Cost (Carrying Value) | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	50.7	21.3
Money Market Funds | Estimated Fair Value | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	50.7	21.3
U.S. Treasuries | Amortized Cost (Carrying Value) | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	49.3	23.9
U.S. Treasuries | Gross Unrealized Holding Losses | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	0.5	0.1
U.S. Treasuries | Estimated Fair Value | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	$ 48.8	$ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://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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