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Subsequent events (Narrative) (Details) - Scenario, Forecast [Member] - Linen Investment Limited - Huya [Member] $ in Millions	Apr. 03, 2020 USD ($) shares
Subsequent events [Line Items]
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal	31.20%
Discontinued Operation Equity Method Investment Retained After Disposal Voting Power After Disposal	43.00%
Class A common shares
Subsequent events [Line Items]
Discontinued Operation Equity Method Investment Sold	16,523,819
Disposal Group, Including Discontinued Operation, Consideration | $	$ 262.6
Class B common shares
Subsequent events [Line Items]
Discontinued Operation Equit yMethod Investment Retained After Disposal Share Afte rDisposal	68,374,463

X

- Definition

Percent, after disposal, of ownership interest of a discontinued operation in which an equity method investment is retained.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760

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- Definition

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+ References

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- Definition

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- Definition

The number of shares of a discontinued operation in which an equity method investment is retained.

+ References

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- Definition

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+ References

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- Definition

The number of shares sold of a discontinued operation transaction.

+ References

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