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CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - € / shares
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value per share (in EUR per share) € 0.01 € 0.01
Common stock, shares authorized 798,096,000 798,096,000
Common stock, shares, issued 226,537,803 225,478,506
Common stock, shares, outstanding 225,114,914 224,289,902
Treasury stock, shares at cost 1,422,889 1,188,604