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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2010
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, weighted average grant date fair value (in dollars per share)   $ 9.29 $ 10.09 $ 7.10
Intrinsic value of stock options exercised   $ 16.0 $ 18.3 $ 11.6
Intrinsic value of shares outstanding   86.8    
Intrinsic value of shares exercisable   76.2    
Equity instruments other than options vested in period   $ 42.0 39.6 30.0
Shares reserved for outstanding options and future grants (in shares)   8,899,574    
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense associated with stock options   $ 8.1 7.5 6.7
Tax benefit recorded resulting from stock option compensation expense recognized   1.9 2.2 2.1
Total unrecognized compensation expense related to non-vested stock options   7.2    
Stock options | 2010 Master Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options exercisable term (in years) 10 years      
Stock option, award vesting period (in years) 3 years      
Performance shares | 2010 Master Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance awards measurement period (in years) 3 years      
Performance award expense   $ 7.5 $ 0.9 $ 0.3