Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

v3.19.2
Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Jun. 30, 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 141,200,000 142,800,000
Treasury stock shares, at cost 10,000,000.0 10,000,000.0