Income taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013	Sep. 23, 2012	Dec. 30, 2012
Income Taxes (Textual) [Abstract]
Unrecognized tax benefits that, if recognized, would impact effective tax rate	$ 22.2		$ 22.2		$ 63.2
Net benefit from the reversal of interest and penalty expense	1.6	2.8	19.0	6.9
Accrued interest and penalties payable related to unrecognized tax benefits	9.7		9.7		29.1
Estimated decrease in gross unrecognized tax positions within the next 12 months, maximum	$ 8.8		$ 8.8

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

+ Details

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

+ Details

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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