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Employee benefits (Details 4)
12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
EUR (€)
Dec. 31, 2012
USD [Member]
Dec. 31, 2012
Euro [Member]
Stock option transactions        
Outstanding options, Beginning Balance     1,792,305 5,133,659
Outstanding, Weighted average exercise price, Beginning Balance $ 34.01 € 24.48    
Granted     11,041 32,240
Granted, Weighted average exercise price $ 51.79 € 39.52    
Exercised     (362,071) (2,928,641)
Exercised, Weighted average exercise price $ 15.87 € 16.07    
Forfeited     (350) (5,530)
Forfeited, Weighted average exercise price $ 33.75 € 18.22    
Expired     (946,089) (1,103,566)
Expired, Weighted average exercise price $ 48.98 € 55.45    
Outstanding options, Ending Balance     494,836 1,128,162
Outstanding, Weighted average exercise price, Ending Balance $ 19.06 € 16.38    
Exercisable     472,586 1,060,262
Exercisable, Weighted average exercise price $ 18.09 € 15.52