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Consolidated statement of changes in shareholders' equity (Parenthetical) - € / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated statement of changes in shareholders' equity      
Dividends proposed € 0.19    
Dividends recognised   € 0.17 € 0.16
Special dividends     € 0.10