Goodwill (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Sep. 15, 2011	Dec. 29, 2012		Dec. 31, 2011		Jan. 01, 2011
Goodwill [Roll Forward]
Goodwill, beginning balance, gross		$ 4,461.1		$ 4,422.2
Accumulated impairment charges, beginning balance		(3,991.3)		(3,991.3)
Goodwill, beginning balance, net		469.8		430.9
Acquisition	40.5	0		40.5
Other adjustments		1.7		(1.6)
Activity during the year		1.7		38.9
Goodwill, ending balance, gross		4,462.8		4,461.1		4,422.2
Accumulated impairment charges, beginning balance		(3,991.3)		(3,991.3)		(3,991.3)
Goodwill, ending balance, net		471.5		469.8		430.9
Purchase consideration	42.3
Cash paid at close	9.9
Payment due one year after close	9.2
Period during which additional payment is due	1 year
Contingent payments	23.2
Contingent consideration payable		1.4
Goodwill, impairment loss		0		0		0
Maximum [Member]
Goodwill [Roll Forward]
Period during which contingent payments are due	3 years
U.S. [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance, gross		4,364.9		4,324.4
Accumulated impairment charges, beginning balance		(3,991.3)		(3,991.3)
Goodwill, beginning balance, net		373.6		333.1
Acquisition		0		40.5
Other adjustments		0		0
Activity during the year		0		40.5
Goodwill, ending balance, gross		4,364.9		4,364.9
Accumulated impairment charges, beginning balance		(3,991.3)		(3,991.3)
Goodwill, ending balance, net		373.6		373.6
Canada [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance, gross		96.2		97.8
Accumulated impairment charges, beginning balance		0		0
Goodwill, beginning balance, net		96.2		97.8
Acquisition		0		0
Other adjustments		1.7	[1]	(1.6)	[1]
Activity during the year		1.7		(1.6)
Goodwill, ending balance, gross		97.9		96.2
Accumulated impairment charges, beginning balance		0		0
Goodwill, ending balance, net		$ 97.9		$ 96.2

[1] Represents foreign currency translation adjustments in Canada.