Inventories
9 Months Ended
Feb. 28, 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)
February 28, 2014
 
May 31, 2013
Raw materials
$
79.0

 
$
78.8

Work-in-process
57.4

 
44.7

Finished goods
548.0

 
500.5

Inventories
$
684.4

 
$
624.0