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Inventories, net
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Inventories, net
Inventories, net

Inventories are valued at the lower of cost or market. The cost of U.S. inventories is determined by the last-in, first-out (“LIFO”) method, while the operations outside the U.S. use the first-in, first-out (“FIFO”) or average-cost methods. Inventories consisted of the following:
 
March 31,
 
December 31,
(millions of dollars)
2014
 
2013
Raw material and supplies
$
317.1

 
$
279.8

Work in progress
93.4

 
78.0

Finished goods
123.7

 
116.3

FIFO inventories
534.2

 
474.1

LIFO reserve
(17.3
)
 
(16.0
)
Inventories, net
$
516.9

 
$
458.1