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CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - € / shares
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value per share (EUR per share) € 0.01 € 0.01
Common stock, shares authorized 798,096,000 798,096,000
Common stock, shares, issued 225,397,828 224,228,071
Common stock, shares, outstanding 224,228,269 223,289,389
Treasury stock, shares at cost 1,169,559 938,682