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Inventories
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories are valued at the lower of cost, as 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)
 
March 31,
2015
 
December 31,
2014
Raw materials and supplies
 
$
183.4

 
$
193.9

Work in process and finished goods
 
387.5

 
381.9

Total inventories
 
$
570.9

 
$
575.8