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Inventories
6 Months Ended
Jun. 30, 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:
 
June 30
 
December 31,
(millions of dollars)
2012
 
2011
Raw material and supplies
$
273.3

 
$
254.4

Work in progress
89.7

 
90.9

Finished goods
128.2

 
124.3

FIFO inventories
491.2

 
469.6

LIFO reserve
(18.5
)
 
(15.3
)
Inventories, net
$
472.7

 
$
454.3