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Inventories
9 Months Ended
Sep. 30, 2012
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories are valued at the lower of cost, as generally determined by the first-in, first-out (FIFO) method, or market.  Inventory values using the FIFO method of accounting approximate replacement cost.  Inventories are summarized as follows:
 
(in millions)
 
September 30,
2012
 
December 31,
2011
Raw materials and supplies
 
$
216.6

 
$
225.2

Work in process and finished goods
 
437.0

 
420.8

Total inventories
 
$
653.6

 
$
646.0