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Employee benefits (Details 7)	12 Months Ended
	Dec. 31, 2012 USD denominated [Member] USD ($)	Dec. 31, 2011 USD denominated [Member] USD ($)	Dec. 31, 2010 USD denominated [Member] USD ($)	Dec. 31, 2012 EUR denominated [Member] EUR (€)	Dec. 31, 2011 EUR denominated [Member] EUR (€)	Dec. 31, 2010 EUR denominated [Member] EUR (€)
Share plan
Conditionally outstanding shares, Beginning balance	264,891			1,479,297
Conditionally outstanding shares, Weighted average grant date fair value, Beginning balance	$ 32.35			€ 24.19
Granted	110,465			678,505
Granted, Weighted average grant date fair value	$ 47.71	$ 39.00	$ 31.66	€ 36.15	€ 28.09	€ 23.51
Vested/Issued	(106,500)			(421,902)
Vested/Issued, Weighted average grant date fair value	$ 31.05			€ 20.88
Forfeited	(19,762)			(42,290)
Forfeited, Weighted average grant date fair value	$ 37.55			€ 19.91
Conditionally outstanding shares, Ending balance	249,094	264,891		1,693,610	1,479,297
Conditionally outstanding shares, Weighted average grant date fair value, Ending balance	$ 40.71	$ 32.35		€ 29.92	€ 24.19

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Weighted average grant date fair value of shares that vested issued during period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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