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Inventories (Tables)
9 Months Ended
Feb. 28, 2015
Inventories [Abstract]  
Schedule of Inventory, Current
(In millions)
February 28, 2015
 
May 31, 2014
Finished goods
$
104.8

 
$
58.2

Raw materials
23.7

 
20.2

Total
$
128.5

 
$
78.4