Impact of New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Feb. 04, 2018	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to Rewards program liability	$ 6.4
Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to retained earnings	10.5
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment to retained earnings	4.8
Cumulative-effect adjustment to Rewards program liability	6.4
Deferred tax liabilities	1.6
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 3.1	$ 2.7	$ 6.2	$ 5.1
Income tax asset | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, tax	5.4
Deferred tax liabilities | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, tax	$ 5.1