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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Nov. 20, 2015
Oct. 31, 2015
Oct. 31, 2014
Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock repurchased (in shares)   14.4 1.3  
Common stock repurchased, value   $ 1,270.0 $ 114.0  
Amounts due for share repurchases   $ 17.0   $ 0.0
Common stock, dividends, per share, cash paid (in dollars per share)   $ 0.3    
Payments of dividends   $ 82.0 $ 74.0  
Dividends declared per common share (in dollars per share)   $ 0.30 $ 0.25  
Allocated share-based compensation expense   $ 67.0 $ 57.0  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non-vested share based compensation expense   $ 56.0    
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years   2 years 2 months    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non-vested share based compensation expense   $ 392.0    
Expected weighted average vesting period to recognize compensation cost related to share based compensation expense, in years   2 years 1 month    
Discontinued Operations, Disposed of by Sale        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense   $ 2.0 $ 4.0  
Software and Software Development Costs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized computer software, gross   2.0    
Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividends declared per common share (in dollars per share) $ 0.3      
New Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock repurchase program, remaining authorized repurchase amount   $ 1.4