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Fair Value Measurements (Narrative) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Level 2 | Non Marketable Equity Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Net unrealized gains (losses) on equity securities	$ 165.1

X

- Definition

Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714

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- Definition

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+ References

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