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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Mar. 31, 2016
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Jan. 29, 2017
Summary of Significant Accounting Policies [Line Items]                          
Cash dividends declared per share (in dollars per share)   $ 0.1600 $ 0.1600 $ 0.1600 $ 0.1350 $ 0.1350 $ 0.1350 $ 0.1350 $ 0.1600 $ 0.1350 $ 0.4800 $ 0.4050  
Operating leases, future minimum payments due                 $ 3,600.0   $ 3,600.0    
Excess tax benefits related to stock-based compensation                     16.1    
Property, Plant and Equipment                          
Summary of Significant Accounting Policies [Line Items]                          
Property and equipment purchased but not yet paid                     $ 6.4 $ 7.4  
Subsequent Event                          
Summary of Significant Accounting Policies [Line Items]                          
Cash dividends declared per share (in dollars per share) $ 0.1600                        
Retained Earnings | Accounting Standards Update 2016-09                          
Summary of Significant Accounting Policies [Line Items]                          
Cumulative-effect adjustment                         $ (1.1)