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Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 9 Months Ended
Dec. 02, 2015
Oct. 31, 2015
Nov. 01, 2014
Aug. 01, 2015
May. 02, 2015
Jan. 31, 2015
Feb. 02, 2013
June 2015 Repurchase Program [Member]              
Amount Authorized       $ 250.0      
Shares Repurchased   1,375          
Amount Repurchased   $ 113.0          
Average Stock Price of Shares Repurchased within Program   $ 82.31          
Remaining authorized repurchase amount   $ 137.0          
February 2015 Repurchase Program [Member] [Member]              
Amount Authorized         $ 250.0    
Shares Repurchased   2,788          
Amount Repurchased   $ 250.0          
Average Stock Price of Shares Repurchased within Program   $ 89.45          
Remaining authorized repurchase amount   $ 0.6          
November 2012 Repurchase Program [Member]              
Amount Authorized             $ 250.0
Shares Repurchased     826        
Amount Repurchased     $ 45.0        
Average Stock Price of Shares Repurchased within Program     $ 48.52        
Remaining authorized repurchase amount         $ 91.0    
Accounts Payable [Member] | June 2015 Repurchase Program [Member]              
Share repurchase reflected in Accounts payable   $ 0.0          
Accounts Payable [Member] | November 2012 Repurchase Program [Member]              
Share repurchase reflected in Accounts payable     $ 0.0     $ 0.0  
Subsequent Event [Member] | June 2015 Repurchase Program [Member]              
Shares Repurchased 1,200            
Amount Repurchased $ 109.0