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Discontinued operations (Details) - Kaola e-commerce business - Discontinued operations, disposed of by sale
shares in Millions, $ in Billions
Sep. 30, 2019
USD ($)
shares
Discontinued operations  
Consideration from sale of business $ 1.9
Consideration from sale of business, cash $ 1.6
Consideration from sale of business, ordinary share (in shares) | shares 14.3