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CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - € / shares
Sep. 30, 2017
Dec. 31, 2016
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 223,906,195 223,161,356
Common stock, shares, outstanding 223,061,559 222,401,427
Treasury stock, shares at cost 844,636 759,929