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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jul. 26, 2019
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Class of Stock                        
Number of shares authorized to be repurchased (in shares)   13,000,000.0               13,000,000.0    
Purchase of treasury stock                   $ 94.3 $ 129.2 $ 122.0
Remaining number of shares authorized to be repurchased (in shares)   10,700,000               10,700,000    
Dividends paid per share (in dollars per share)   $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.21 $ 0.19 $ 0.19 $ 0.19 $ 0.840 $ 0.780  
Dividends payable   $ 26.6       $ 26.9       $ 26.6 $ 26.9  
Cash dividend declared per common share (in dollars per share) $ 0.210                 $ 0.84 $ 0.80 $ 0.74
Treasury Stock                        
Class of Stock                        
Stock repurchases (in shares)                   2,030,545 2,636,554