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Discontinued Operations (Tables)
 9 Months Ended
Sep. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of Discontinued Operations
These results are primarily from NiSource's former Columbia Pipeline Group Operations segment.
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2015
 
September 30, 2015
(in millions)
Columbia Pipeline Group Operations
 
Corporate and Other
 
Total
 
Columbia Pipeline Group Operations
 
Corporate and Other
 
Total
Net Revenues
 
 
 
 
 
 
 
 
 
 
 
Transportation and storage revenues
$
—

 
$
—

 
$
—

 
$
561.4

 
$
—

 
$
561.4

Other revenues
—

 
—

 
—

 
94.3

 
—

 
94.3

Total Sales Revenues
—

 
—

 
—

 
655.7

 
—

 
655.7

Less: Cost of sales (excluding depreciation and amortization)
—

 
—

 
—

 
0.2

 
—

 
0.2

Net Revenues
—

 
—

 
—

 
655.5

 
—

 
655.5

Operating Expenses
 
 
 
 
 
 
 
 
 
 
 
Operation and maintenance
5.5

(1) 
—

 
5.5

 
374.8

(1) 
—

 
374.8

Depreciation and amortization
—

 
—

 
—

 
66.4

 
—

 
66.4

Gain on sale of assets
—

 
—

 
—

 
(13.6
)
 
—

 
(13.6
)
Other taxes
—

 
—

 
—

 
38.0

 
—

 
38.0

Total Operating Expenses
5.5

 
—

 
5.5

 
465.6

 
—

 
465.6

Equity Earnings in Unconsolidated Affiliates
—

 
—

 
—

 
29.1

 
—

 
29.1

Operating Income (Loss) from Discontinued Operations
(5.5
)
 
—

 
(5.5
)
 
219.0

 
—

 
219.0

Other Income (Deductions)
 
 
 
 
 
 
 
 
 
 
 
Interest expense, net
—

 
—

 
—

 
(37.1
)
 
—

 
(37.1
)
Other, net
—

 
—

 
—

 
7.8

 
(0.6
)
 
7.2

Total Other Deductions
—

 
—

 
—

 
(29.3
)
 
(0.6
)
 
(29.9
)
Income (Loss) from Discontinued Operations before Income Taxes
(5.5
)
 
—

 
(5.5
)
 
189.7

 
(0.6
)
 
189.1

Income Taxes
14.2

(2) 
—

 
14.2

 
80.9

 
(0.3
)
 
80.6

Income (Loss) from Discontinued
Operations - net of taxes
$
(19.7
)
 
$
—

 
$
(19.7
)
 
$
108.8

 
$
(0.3
)
 
$
108.5


(1) Includes approximately $5.5 million and $54.4 million of transaction costs related to the Separation for the three and nine months ended September 30, 2015, respectively.
(2)