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Investments (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
May 31, 2013
Investments (Details) [Line Items]      
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 23.7 $ 22.9 $ 19.6
Equity Method Investments 18.9 17.3 14.6
Income (Loss) from Equity Method Investments 1.8 1.5  
Income (Loss) from Equity Method Investment Settlement   1.3  
Software Development Business [Member]
     
Investments (Details) [Line Items]      
Equity Method Investment, Ownership Percentage 20.00%    
Equity Method Investments $ 1.0    
UK Non-controlling [Member]
     
Investments (Details) [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent 15.00%    
UK Equity-method [Member]
     
Investments (Details) [Line Items]      
Equity Method Investment, Ownership Percentage 26.20%