Segment Reporting Net Sales (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 29, 2012		Dec. 31, 2011		Dec. 25, 2010
Segment Reporting
Net sales	$ 1,030.2	$ 1,195.5	$ 999.4	$ 691.4	$ 937.3	$ 954.4	$ 933.6	$ 690.4	$ 3,916.5		$ 3,515.7		$ 3,254.4
Central Europe
Segment Reporting
Number of countries in which segment operates	9								9
Unaffiliated Customers
Segment Reporting
Net sales									3,916.5		3,515.7		3,254.4
Canada
Segment Reporting
Net sales									2,036.8		2,067.3		1,938.2
Canada | Unaffiliated Customers
Segment Reporting
Net sales									1,930.7		1,987.4		1,894.9
United States and its territories | Unaffiliated Customers
Segment Reporting
Net sales									107.3		81.3		44.6
United Kingdom
Segment Reporting
Net sales									1,266.3		1,333.5		1,234.9
United Kingdom | Unaffiliated Customers
Segment Reporting
Net sales									1,218.4		1,313.9		1,217.7
Other foreign countries(1) | Unaffiliated Customers
Segment Reporting
Net sales									$ 660.1	[1]	$ 133.1	[1]	$ 97.2	[1]

[1] Reflects the addition of our Central Europe segment, which operates in nine countries and for which no individual country has total net sales exceeding 10% of the total consolidated net sales.