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Income taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 25, 2012
Dec. 30, 2012
Income Taxes (Textual) [Abstract]      
Unrecognized tax benefits that, if recognized, would impact effective tax rate $ 40.2   $ 63.2
Net benefit from the reversal of interest and penalty expense 12.7 2.1  
Accrued interest and penalties payable related to unrecognized tax benefits 16.4   29.1
Estimated decrease in gross unrecognized tax positions within the next 12 months, maximum $ 24.7