Income Taxes (Tax Credit Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010
Foreign [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 123.2	$ 176.1
Deferred costs assets related to advanced payment agreements	77.5
Deferred assets, period of reversal	3 years
Deferred costs assets related to advanced transaction agreements	54.8
Federal [Member]
Tax Credit Carryforward [Line Items]
Increase (decrease) to federal foreign tax credit carryforwards, net of offsetting tax reserves	$ (49.5)