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Share-Based Awards and Options - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Share-based compensation expense $ 21.1 $ 29.8 $ 18.4  
Total Shareholder Return Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award performance period 3 years      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested, beginning of period (in shares) 1,754 2,192    
Granted (in shares) 954 1,088    
Vested (in shares) (648) (1,286)    
Forfeited (in shares) (212) (240)    
Nonvested, end of period (in shares) 1,848 1,754 2,192  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Nonvested, Weighted Average Grant-Date Fair Value, beginning of period (in dollars per share) $ 22.72 $ 22.00    
Granted, Weighted Average Grant-Date Fair Value (in dollars per share) 36.21 23.55    
Vested, Weighted Average Grant-Date Fair Value (in dollars per share) 23.17 22.31    
Forfeited, Weighted Average Grant-Date Fair Value (in dollars per share) 27.03 22.40    
Nonvested, Weighted Average Grant-Date Fair Value, end of period (in dollars per share) $ 28.97 $ 22.72 $ 22.00  
Total fair value of share awards vested in period $ 15.0 $ 28.7 $ 13.6  
Share-based compensation expense $ 19.8 $ 28.2 $ 16.2  
Total unrecognized compensation cost       $ 41.3
Total unrecognized compensation cost, weighted average period 2 years 1 month 6 days      
Maximum | Total Shareholder Return Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Target shares of company stock 200.00%      
One Year Increment [Member] | Restricted Stock and Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years