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Inventories
3 Months Ended
Mar. 31, 2013
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)
2013
 
2012
Raw material and supplies
$
271.8

 
$
264.0

Work in progress
80.7

 
82.0

Finished goods
113.4

 
117.6

FIFO inventories
465.9

 
463.6

LIFO reserve
(16.4
)
 
(16.0
)
Inventories, net
$
449.5

 
$
447.6