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Discontinued Operations (Tables)
 9 Months Ended
Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Income Statement Impact Of Discontinued Operations [Table Text Block]
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2014
 
(in millions)
REVENUES
 
 
 
NGL sales
$
28.8

 
$
94.6

Other revenue
43.1

 
119.9

Purchased gas and oil sales(1)
(11.9
)
 
(38.5
)
Total Revenues
60.0

 
176.0

OPERATING EXPENSES
 
 
 
Purchased gas and oil expense(1)
(12.4
)
 
(39.5
)
Lease operating expense(1)
(1.7
)
 
(4.8
)
Natural gas, oil and NGL transport and other handling costs(1)
(10.6
)
 
(40.1
)
Gathering, processing, and other
22.7

 
69.8

General and administrative
11.1

 
34.3

Production and property taxes
2.1

 
6.1

Depreciation, depletion and amortization
14.3

 
43.1

Total Operating Expenses
25.5

 
68.9

Net loss from asset sales
—

 
(0.1
)
OPERATING INCOME
34.5

 
107.0

Income from unconsolidated affiliates
1.1

 
4.4

Interest expense
(1.5
)
 
(2.8
)
INCOME FROM DISCONTINUED OPERATIONS BEFORE INCOME TAXES (2)
34.1

 
108.6

Income tax provision
(9.9
)
 
(32.8
)
NET INCOME FROM DISCONTINUED OPERATIONS
24.2

 
75.8

Net income attributable to noncontrolling interest
(6.8
)
 
(17.6
)
NET INCOME FROM DISCONTINUED OPERATIONS, NET OF INCOME TAX
$
17.4

 
$
58.2