Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
The Netherlands [Member]
     
Income Tax Disclosure [Line Items]      
Corporate income tax rate 25.00% [1] 25.00% [1] 25.50% [1]
Ireland [Member]
     
Income Tax Disclosure [Line Items]      
Corporate income tax rate 12.50% [1] 12.50% [1] 12.50% [1]
United States Of America [Member]
     
Income Tax Disclosure [Line Items]      
Corporate income tax rate 37.60% [1] 37.60% [1] 37.30% [1]
[1] The local statutory income tax expense for our significant tax jurisdictions (The Netherlands, Ireland and Isle of Man) does not differ from the actual income tax expense.