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Inventories
9 Months Ended
Feb. 28, 2013
Inventories [Abstract]  
Schedule of inventories

7. Inventories

Inventories consist of the following:

   February 28,  May 31,
   2013  2012
 Raw materials$ 40.4 $ 61.8
 Work in process  395.5   340.1
 Finished goods  1,055.6   764.8
 Operating materials and supplies  77.9   70.9
  $ 1,569.4 $ 1,237.6