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Consolidated Income Statement (Parenthetical)
 6 Months Ended
Jun. 30, 2019
Profit or loss [abstract]  
Increase/ (Decrease) in Turnover, Current rates (0.90%)
Increase/ (Decrease) in Operating profit, Current rates 1.30%
Increase/ (Decrease) in Profit before taxation, Current rates 0.60%
Increase/ (Decrease) in Net profit, Current rates (0.60%)
Increase/ (Decrease) in Shareholders' equity, Current rates (0.80%)
Increase/ (Decrease) in Basic earnings per share, Current rates 3.40%
Increase/ (Decrease) in Diluted earnings per share, Current rates 3.40%
Increase/ (Decrease) in Turnover, Constant rates (0.70%)
Increase/ (Decrease) in Operating profit, Constant rates 0.90%
Increase/ (Decrease) in Profit before taxation, Constant rates (0.10%)
Increase/ (Decrease) in Net profit, Constant rates (1.50%)
Increase/ (Decrease) in Shareholders' equity, Constant rates (1.90%)
Increase/ (Decrease) in Basic earnings per share, Constant rates 2.30%
Increase/ (Decrease) in Diluted earnings per share, Constant rates 2.30%