Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 30, 2011	Jul. 31, 2010	Jul. 30, 2011	Jul. 31, 2010
Income Taxes
Effective income tax rate on continuing operations	53.90%	10.60%	87.50%	15.40%
Net favorable discrete events			$ 1.4	$ 2.7
Unrecognized tax benefits, inclusive of related interest and penalties	38.3	65.9	38.3	65.9
Portion of unrecognized tax benefits that would impact the effective income tax rate if recognized	24.7	40.0	24.7	40.0
Potential decrease in unrecognized tax benefits	4.1		4.1
Favorable impact in the period of recognition, maximum	$ 3.4		$ 3.4