Income Per Share (Basic and Diluted Earnings Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 08, 2012	Sep. 10, 2011	Sep. 08, 2012	Sep. 10, 2011
Earnings Per Share [Abstract]
Income from continuing operations, net of tax	$ 108.0	$ 130.3	$ 311.2	$ 301.4
Noncontrolling interests	0	(0.1)	(0.3)	(0.3)
Distributed and undistributed earnings allocated to participating securities	(1.1)	(0.9)	(3.0)	(1.8)
Income from continuing operations available to common stockholders, Diluted	106.9	129.3	307.9	299.3
Income from continuing operations available to common stockholders, Basic	106.9	129.3	307.9	299.3
Gain from discontinued operations, net of tax	49.0	0	41.6	0
Net income available to common stockholders after earnings allocated to participating securities, diluted	155.9	129.3	349.5	299.3
Net income available to common stockholders after earnings allocated to participating securities, basic	$ 155.9	$ 129.3	$ 349.5	$ 299.3
Weighted average common shares outstanding	237.1	342.8	249.4	353.2
Dilutive stock options	0	0.2	0.2	0.5
Weighted average shares outstanding, diluted	237.1	343.0	249.6	353.7
Earnings (loss) per common share: from Continuing operations, Diluted	$ 0.45	$ 0.38	$ 1.23	$ 0.85
Earnings (loss) per common share: from Continuing operations, Basic	$ 0.45	$ 0.38	$ 1.23	$ 0.85
Earnings (loss) per common share: from Discontinued operation, Diluted	$ 0.21	$ 0.00	$ 0.17	$ 0.00
Earnings (loss) per common share: from Discontinued operation, Basic	$ 0.21	$ 0.00	$ 0.17	$ 0.00
Earnings (loss) per common share, Diluted	$ 0.66	$ 0.38	$ 1.40	$ 0.85
Earnings (loss) per common share, Basic	$ 0.66	$ 0.38	$ 1.40	$ 0.85