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Variable Interest Entities (Tables)
9 Months Ended
Feb. 28, 2013
Noncontrolling Interest [Abstract]  
Schedule of variable interest entities

The carrying amounts and classification of assets and liabilities included in our Condensed Consolidated Balance Sheets for these consolidated entities are as follows:

    February 28,  May 31,
    2013  2012
 Current assets $ 137.4 $ 138.6
 Non current assets   47.9   49.4
 Total assets $ 185.3 $ 188.0
        
 Current liabilities $ 4.2 $ 39.6
 Total liabilities $ 4.2 $ 39.6