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Income taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012	Dec. 30, 2012
Income Taxes (Textual) [Abstract]
Unrecognized tax benefits that, if recognized, would impact effective tax rate	$ 32.8		$ 32.8		$ 63.2
Net benefit from the reversal of interest and penalty expense	4.6	2.0	17.4	4.1
Accrued interest and penalties payable related to unrecognized tax benefits	11.9		11.9		29.1
Estimated decrease in gross unrecognized tax positions within the next 12 months, maximum	$ 9.7		$ 9.7

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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