Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Common shares, par value $ 0.0005 $ 0.0005
Common shares, shares authorized 2,000,000,000.0 2,000,000,000.0
Common shares, shares outstanding 137,400,000 142,800,000
Treasury stock shares, at cost 10,000,000.0 10,000,000.0