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Investments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
May 31, 2013
Investments (Details) [Line Items]          
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 19.4 $ 20.6 $ 19.4 $ 20.6 $ 19.6
Equity Method Investments 19.4 15.2 19.4 15.2 14.6
Gain (Loss) on Investments 4.7 0 4.7 0  
Income (Loss) from Equity Method Investments     1.7 1.5  
Income (Loss) from Equity Method Investment Settlement       1.3  
UK Non-controlling
         
Investments (Details) [Line Items]          
Noncontrolling Interest, Ownership Percentage by Parent 15.00%   15.00%    
UK Equity-method
         
Investments (Details) [Line Items]          
Equity Method Investment, Ownership Percentage 26.20%   26.20%    
Software Development Business
         
Investments (Details) [Line Items]          
Equity Method Investment, Ownership Percentage 20.00%   20.00%    
Equity Method Investments $ 1.0   $ 1.0