Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Nov. 30, 2017	Oct. 28, 2017	Oct. 29, 2016	Apr. 29, 2017	Jan. 28, 2017	Apr. 30, 2016
Shares Repurchased		6,486,000	5,270,000
Amount Repurchased		$ 282.0	$ 410.0
September 2017 Repurchase Program [Member]
Amount Authorized		$ 250.0
Shares Repurchased		935,000
Amount Repurchased		$ 39.0
Average Stock Price of Shares Repurchased within Program		$ 41.30
Remaining authorized repurchase amount		$ 211.0
Share repurchase reflected in Accounts payable		$ 2.0
February 2017 Repurchase Program [Member]
Amount Authorized				$ 250.0
Shares Repurchased		5,500,000
Amount Repurchased		$ 240.0
Average Stock Price of Shares Repurchased within Program		$ 43.57
Remaining authorized repurchase amount		$ 10.0
February 2016 Repurchase Program [Member]
Amount Authorized						$ 500.0
Shares Repurchased		51,000	5,270,000
Amount Repurchased		$ 3.0	$ 410.0
Average Stock Price of Shares Repurchased within Program		$ 58.95	$ 77.75
Remaining authorized repurchase amount				$ 59.0
June 2015 Repurchase Program [Member]
Remaining authorized repurchase amount						$ 17.0
Accounts Payable [Member] | February 2016 Repurchase Program [Member]
Share repurchase reflected in Accounts payable			$ 0.0		$ 3.0
Subsequent Event [Member]
Treasury Stock, Shares, Retired	36
Subsequent Event [Member] | September 2017 Repurchase Program [Member]
Shares Repurchased	100,000
Amount Repurchased	$ 6.0