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CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - € / shares
Mar. 31, 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 (in shares) 798,096,000 798,096,000
Common stock, shares, issued (in shares) 223,682,683 223,161,356
Common stock, shares, outstanding (in shares) 222,775,566 222,401,427
Treasury stock, shares at cost (in shares) 907,117 759,929