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Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012	Dec. 30, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits that if recognized would affect effective tax rate				$ 13.4
Unrecognized tax benefits reduction relating to expiration of statutes of limitations		2.0
Income tax penalties and interest expense	0.3	0
Benefit for interest and penalties related to reversal of prior positions		(0.2)	(0.1)
Liabilities for uncertain tax positions that will expire within 12 months		0.1
Discontinued operations
Income Tax Contingency [Line Items]
Unrecognized tax benefits reduction relating to expiration of statutes of limitations		$ 0.1

This element represents the total of interest expense 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 in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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