Segment Reporting Net Sales (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011	Sep. 25, 2010
Segment Reporting
Net sales	$ 954.4	$ 875.0	$ 2,578.4	$ 2,419.3
Maximum percentage of sales accounted for by a single customer (as a percent)			10.00%
Canada
Segment Reporting
Net sales	598.9	539.8	1,557.4	1,471.8
U.K.
Segment Reporting
Net sales	327.2	313.4	943.6	888.9
MCI and Corporate
Segment Reporting
Net sales	31.5	21.8	81.9	58.6
Intersegment sales elimination
Segment Reporting
Net sales	$ (3.2)	$ 0	$ (4.5)	$ 0