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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our inventory is comprised of the following:
 
 
 
December 31,
 
 
 
2016
 
2015
 
 
 
(in millions)
 
Materials and supplies
 
$
1.8
 
$
2.2
 
Crude oil inventory
 
 
1.3
 
 
1.6
 
Natural gas and NGL inventory
 
 
27.8
 
 
31.3
 
Total inventory
 
$
30.9
 
$
35.1