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Commitments (Tables)
12 Months Ended
May 31, 2012
Commitments And Contingencies Disclosure [Abstract]  
A schedule of future minimum long-term purchase commitments and future minimum lease payments

A schedule of future minimum long-term purchase commitments, based on May 31, 2012 market prices, and minimum lease payments under non-cancelable operating leases as of May 31, 2012 follows:

 (in millions)  Purchase Commitments  Operating Leases
 2013 $ 1,874.0 $ 41.1
 2014   315.8   24.6
 2015   176.6   16.3
 2016   117.7   10.2
 2017   107.4   6.3
 Subsequent years   2,099.9   13.9
   $ 4,691.4 $ 112.4