Assets and Liabilities Held for Sale and Discontinued Operations (Financial Results of Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		4 Months Ended
	Mar. 22, 2014	Mar. 23, 2013	Dec. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales and other revenue	$ 7.3	$ 1,823.1
(Loss) income from discontinued operations, before income taxes	(61.8)	64.9
(Loss) gain on sale or disposal of operations, net of lease exit costs, before income taxes	37.0	0	(493.1)
Total (loss) income from discontinued operations before income taxes	(24.8)	64.9
Income taxes on discontinued operations	9.3	(5.8)
(Loss) income from discontinued operations, net of tax	(15.5)	59.1
Canada Safeway Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales and other revenue	0	1,493.2
(Loss) income from discontinued operations, before income taxes	0	76.2
(Loss) gain on sale or disposal of operations, net of lease exit costs, before income taxes	(5.1)	0
Dominick's Stores [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales and other revenue	7.3	329.9
(Loss) income from discontinued operations, before income taxes	(61.8)	(11.3)
(Loss) gain on sale or disposal of operations, net of lease exit costs, before income taxes	$ 42.1	$ 0