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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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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

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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
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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- Definition

The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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