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Common stock transactions (Details) (Common stock, USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended
	Dec. 30, 2011 2011 repurchase program	Nov. 02, 2012 2011 repurchase program	Aug. 31, 2012 2012 repurchase program	Nov. 02, 2012 2012 repurchase program	Nov. 02, 2012 Significant shareholder Buck Holdings, L.P. 2011 repurchase program	Nov. 02, 2012 Significant shareholder Buck Holdings, L.P. 2012 repurchase program
Common stock transactions
Common stock repurchase authorization	$ 500		$ 500
Remaining authorization under the repurchase program				218.6
Shares acquired under share repurchase program		7.1		5.6	6.8	4.9
Aggregate purchase price		$ 315.0		$ 281.4	$ 300.0	$ 250.0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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