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Inventories
3 Months Ended
Mar. 31, 2012
Inventory Disclosure [Abstract]  
Inventories
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)
2012
 
2011
Raw material and supplies
$
272.0

 
$
254.4

Work in progress
94.9

 
90.9

Finished goods
131.2

 
124.3

FIFO inventories
498.1

 
469.6

LIFO reserve
(17.3
)
 
(15.3
)
Inventories, net
$
480.8

 
$
454.3