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Property, Plant and Equipment
12 Months Ended
May 31, 2013
Property Plant And Equipment [Abstract]  
Property Plant And Equipment Disclosure [Text Block]

6. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consist of the following:

    May 31,
 (in millions)  2013  2012
 Land $188.7 $187.7
 Mineral properties and rights   2,886.7   2,791.0
 Buildings and leasehold improvements   1,959.3   1,456.0
 Machinery and equipment   5,793.7   4,872.6
 Construction in-progress   1,419.2   1,522.8
     12,247.6   10,830.1
 Less: accumulated depreciation and depletion   3,760.8   3,284.2
   $8,486.8 $7,545.9

Depreciation and depletion expense was $604.8 million, $508.1 million and $447.4 million for fiscal 2013, 2012 and 2011, respectively. Capitalized interest on major construction projects was $53.8 million, $55.7 million and $57.1 million in fiscal 2013, 2012 and 2011, respectively.