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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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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