Segment Reporting Net Sales (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 25, 2011		Jun. 30, 2012		Jun. 25, 2011
Segment Reporting
Net sales	$ 999.4		$ 933.6		$ 1,690.8		$ 1,624.0
Maximum percentage of sales accounted for by a single customer (as a percent)					10.00%
Canada
Segment Reporting
Net sales	582.9		564.7		985.2		958.5
Central Europe
Segment Reporting
Net sales	57.3	[1]	0	[1]	57.3	[1]	0	[1]
U.K.
Segment Reporting
Net sales	326.2		341.7		589.6		616.4
MCI
Segment Reporting
Net sales	37.1		28.2		65.2		49.8
Corporate
Segment Reporting
Net sales	0.4		0.3		0.7		0.6
Intersegment sales elimination
Segment Reporting
Net sales	$ (4.5)	[2]	$ (1.3)	[2]	$ (7.2)	[2]	$ (1.3)	[2]

[1] Represents Central Europe net sales from the Acquisition date of June 15, 2012 through June 30, 2012.

[2] Represents inter-segment sales from the U.K. segment to the MCI segment.