Inventories (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Inventory [Line Items]
Percentage of FIFO inventory	62.00%	64.00%
United States [Member]
Inventory [Line Items]
Percentage of FIFO inventory	28.00%
Percentage of LIFO inventory	72.00%
LIFO inventory liquidations to the reduction in cost of goods sold	$ 0	$ 0	$ 9.5