Income Taxes (Uncertain Tax Positions) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 23.3
Accrued interest and penalties	5.8	5.1
Interest and penalties provision (benefit)	1.2	0.8	(1.0)
Decrease in unrecognized tax benefits		4.2
Decrease in accruals for unrecognized tax benefits interest and penalties		7.7
Estimated maximum decrease in uncertain tax positions accrual due to settlements in the next twelve months	2.2
Reconciliation of unrecognized tax benefits [Roll Forward]
Unrecognized tax benefits beginning balance	27.3	53.1	46.9
Additions based on tax positions related to the current year	3.5	10.5	15.1
Additions for tax positions of prior year	4.6	2.8	0.7
Reduction for tax positions of prior years	(4.7)	(27.2)	(8.7)
Settlements	(0.2)	(11.3)	(0.5)
Reductions for lapse in statute of limitations	(1.3)	(0.9)	(2.1)
Impact of foreign currency rate changes versus the U.S. dollar	(0.6)	0.3	1.7
Unrecognized tax benefits ending balance	28.6	27.3	53.1
Foreign [Member]
Income Tax Contingency [Line Items]
Decrease in accruals for unrecognized tax benefits interest and penalties	0.3
Payments of interest and taxes	0.4
Reduction in liability	1.2
Reconciliation of unrecognized tax benefits [Roll Forward]
Reduction for tax positions of prior years		22.3
Settlements	(3.2)	(1.9)
MEXICO
Income Tax Contingency [Line Items]
Settlement payment for uncertain tax positions		15.6
Uncertain tax positions settlement, tax portion		9.2
Uncertain tax positions settlement, interest portion		$ 6.4