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Inventories
6 Months Ended
Nov. 30, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories.
Inventories are stated at the lower of cost or market, with cost determined under the first-in, first-out method. The Company reviews inventory on hand and writes down excess and slow-moving inventory based on an assessment of future demand and historical experience. Inventories consisted of the following:
 
(in millions)
November 30, 2014
 
May 31, 2014
Raw materials
$
91.3

 
$
83.1

Work-in-process
48.2

 
54.4

Finished goods
582.2

 
555.9

Inventories
$
721.7

 
$
693.4