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Business Segment Information
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Business Segment Information
Business Segment Information
On July 1, 2015, NiSource completed the Separation. CPG's operations consisted of all of NiSource's Columbia Pipeline Group Operations segment prior to the Separation. Results of the Columbia Pipeline Group Operations segment are included in discontinued operations.
At September 30, 2015, NiSource’s operations are divided into two primary business segments. The Gas Distribution Operations segment provides natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, Indiana and Massachusetts. The Electric Operations segment provides electric service in 20 counties in the northern part of Indiana.
The following table provides information about business segments. NiSource uses operating income as its primary measurement for each of the reported segments and makes decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.
 
 
Three Months Ended
September 30,
 
Nine Months Ended September 30,
(in millions)
2015
 
2014
 
2015
 
2014
Revenues
 
 
 
 
 
 
 
Gas Distribution Operations
 
 
 
 
 
 
 
Unaffiliated
$
384.6

 
$
411.9

 
$
2,349.3

 
$
2,593.9

Intersegment
0.1

 
—

 
0.4

 
0.2

Total
384.7

 
411.9

 
2,349.7

 
2,594.1

Electric Operations
 
 
 
 
 
 
 
Unaffiliated
428.4

 
424.4

 
1,199.5

 
1,279.9

Intersegment
0.2

 
0.3

 
0.6

 
0.6

Total
428.6

 
424.7

 
1,200.1

 
1,280.5

Corporate and Other
 
 
 
 
 
 
 
Unaffiliated
4.2

 
1.9

 
5.2

 
5.3

Intersegment
94.1

 
105.9

 
288.1

 
303.6

Total
98.3

 
107.8

 
293.3

 
308.9

Eliminations
(94.4
)
 
(106.2
)
 
(289.1
)
 
(304.4
)
Consolidated Gross Revenues
$
817.2

 
$
838.2

 
$
3,554.0

 
$
3,879.1

Operating Income (Loss)
 
 
 
 
 
 
 
Gas Distribution Operations
$
20.0

 
$
0.8

 
$
394.9

 
$
362.4

Electric Operations
98.5

 
76.9

 
214.2

 
218.7

Corporate and Other
(8.8
)
 
(6.6
)
 
(28.7
)
 
(18.9
)
Consolidated Operating Income
$
109.7

 
$
71.1

 
$
580.4

 
$
562.2