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Common stock transactions (Details) (Common Stock, USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 19, 2013	May 03, 2013	May 04, 2012
Common Stock
Common stock transactions
Common stock repurchase authorization	$ 500
Shares acquired under share repurchase program		0.4	6.8
Aggregate purchase price		20.0	300.0
Remaining authorization under the repurchase program		$ 623.6

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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