Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 24, 2012	Jun. 26, 2011	Dec. 25, 2011
Income Taxes (Textual) [Abstract]
Unrecognized tax benefits that, if recognized, would impact effective tax rate	$ 83.8		$ 77.7
Total amount of unrecognized tax benefits, excluding the federal tax benefit of state tax deductions	113.6		110.3
Unrecognized Tax Benefits, Period Increase (Decrease)	3.3
Unrecognized tax benefits, increase for current year tax positions	6.4
Unrecognized tax benefits, increase for prior year tax positions	9.0
Unrecognized tax benefits, reductions for prior year tax positions	10.1
Tax settlements	1.2
lapse of statutes of limitations	0.9
Recognized income (expense) from interest and the release of penalty reserves	2.0	(0.5)
Accrued interest and penalties payable related to unrecognized tax benefits	30.9		34.8
Estimated decrease in gross unrecognized tax positions within the next 12 months, maximum	$ 49.3

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Recognized Interest Income Expense and Penalties Related to Unrecognized Tax Benefits

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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.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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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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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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

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