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Basis of Presentation Revision of Financial Statements (Tables)
 6 Months Ended
Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
 
 
Three Months Ended June 30, 2015
 
Six Months Ended June 30, 2015
 
 
As reported
 
As revised
 
Change
 
As reported
 
As revised
 
Change
 
 
(in millions)
REVENUES
 
 
 
 
 
 
 
 
 
 
 
 
Purchased gas and oil sales
 
$
215.0

 
$
181.0

 
$
(34.0
)
 
$
382.3

 
$
324.8

 
$
(57.5
)
Total Revenues
 
608.6

 
574.6

 
(34.0
)
 
1,100.2

 
1,042.7

 
(57.5
)
OPERATING EXPENSES
 
 
 
 
 
 
 
 
 
 
 

Purchased gas and oil expense
 
$
217.2

 
$
183.2

 
$
(34.0
)
 
$
386.6

 
$
329.1

 
$
(57.5
)
Total Operating Expenses
 
649.8

 
615.8

 
(34.0
)
 
1,239.5

 
1,182.0

 
(57.5
)