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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventories [Abstract]  
Components of Inventories

  
March 31, 2015
  
December 31, 2014
 
Partnership:
    
Commodities
 
$
66.9
  
$
157.4
 
Materials and supplies
  
11.3
   
11.5
 
  
$
78.2
  
$
168.9