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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
May 31, 2014
May 31, 2014
May 31, 2013
May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation related to shares vested as a result of Shredding transaction   $ 12.4    
Stock Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized under plan (shares) 14,000,000 14,000,000    
Shares reserved for future issuance (shares) 4,683,607 4,683,607    
Stock-based compensation   44.7 23.3 20.3
The total income tax benefit recognized in the consolidated income statement for share-based compensation arrangements   17.2 8.6 7.5
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options vested as result of Shredding transaction 249,335      
Maximum term after grant options may be exercised (years)   10 years    
Options vesting period (years)   10 years    
Weighted-average fair value of stock options granted (dollars per share)   $ 16.18 $ 9.60 $ 9.48
Intrinsic value of options exercised during the period   19.8 3.7 0.6
Proceeds from stock options exercised   41.9 14.8 3.3
Fair value of vested stock options   17.7 13.2 12.9
Aggregate intrinsic value of outstanding options 151.3 151.3    
Aggregate intrinsic value of exercisable options 42.3 42.3    
The weighted-average remaining contractual term of stock options exercisable (years)   3 years 10 months 24 days    
Stock Options [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options vesting period (years)   3 years    
Stock Options [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options vesting period (years)   5 years    
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options vested as result of Shredding transaction 71,882      
Vesting period of awards (years)   3 years    
Unrecognized compensation cost related to unvested stock options and restricted stock $ 77.6 $ 77.6    
Weighted average over which stock options and restricted stock costs will be recognized (years)   2 years 3 months 18 days