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Basic and Diluted Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
Dec. 31, 2020
Dec. 31, 2019
Warrants [Member]    
Earning Per Share Basic And Diluted [Line Items]    
Anti Dilutive Effect on Shares 16.0 24.1
Share Option [Member]    
Earning Per Share Basic And Diluted [Line Items]    
Anti Dilutive Effect on Shares 0.2 0.4
Covertible Note [Member]    
Earning Per Share Basic And Diluted [Line Items]    
Anti Dilutive Effect on Shares 41.0 20.0