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Inventories (Tables)
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Components of inventory
The components of inventories consisted of the following:

 
 
March 31, 2013
  
December 31, 2012
 
Natural gas liquids
 $44.2  $82.3 
Materials and supplies
  21.8   17.1 
 
 $66.0  $99.4