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Employee benefits (Details 2) (EUR €)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Assumptions of fair value of the Company's stock options
Weighted average share price (in EUR)	€ 40.3		€ 28.0		€ 24.1
Volatility (in percentage)	25.60%		37.80%		36.40%
Expected life (in years)	5 years	[1]	4 years 9 months 18 days	[1]	4 years 7 months 6 days
Risk free interest rate	2.10%		2.90%		2.50%
Expected dividend yield (in EUR)	€ 1.45		€ 1.25		€ 1.06
Forfeiture rate		[1]		[1]		[1]
[1] As of year end for each of the three years ended December 31, forfeitures are estimated to be nil.

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Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Forfeiture Rate.

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Share Based Payment Award Fair Value Assumptions Weighted Average Share Price.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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