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Fair Value Measurements - Reconciliation of Our Investment in Restricted Equity Securities Measured at Fair Value on Quarterly Basis Using Significant Unobservable Inputs (Level 3) (Detail) - Level 3 - Fair Value, Recurring - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Equity securities–biotechnology industry |  |  |  |
Fair Value, Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Roll Forward] |  |  |  |
Purchases | $ 0.0 | $ 4.6 | $ 0.0 | $ 4.6
Equity securities–biotechnology industry |  |  |  |
Fair Value, Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Roll Forward] |  |  |  |
Balance at beginning of period | 0.0 | 38.9 | 11.0 | 38.2
Unrealized gain (loss) included in earnings | 0.0 | (8.2) | 20.8 | (7.5)
Transfers out of Level 3 | 0.0 | 0.0 | (31.8) | 0.0
Balance at end of period | $ 0.0 | $ 35.3 | $ 0.0 | $ 35.3

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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