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Business Segment Information
 6 Months Ended
Jun. 30, 2013
Segment Reporting [Abstract]  
Segments Of Business
Business Segment Information
Operating segments are components of an enterprise for which separate financial information is available and evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. NiSource's Chief Executive Officer is the chief operating decision maker.
At June 30, 2013, NiSource’s operations are divided into three 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 Columbia Pipeline Group (formerly known as Gas Transmission and Storage) Operations segment offers gas transportation and storage services for LDCs, marketers and industrial and commercial customers located in northeastern, mid-Atlantic, midwestern and southern states along with unregulated businesses that include midstream services and development of mineral rights positions. 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
June 30,
 
Six Months Ended
June 30,
(in millions)
2013
 
2012
 
2013
 
2012
REVENUES
 
 
 
 
 
 
 
Gas Distribution Operations
 
 
 
 
 
 
 
Unaffiliated
$
572.4

 
$
443.8

 
$
1,717.3

 
$
1,503.9

Intersegment
—

 
0.1

 
0.2

 
0.3

Total
572.4

 
443.9

 
1,717.5

 
1,504.2

Columbia Pipeline Group Operations
 
 
 
 
 
 
 
Unaffiliated
242.3

 
209.5

 
500.7

 
442.5

Intersegment
31.5

 
31.5

 
74.5

 
73.9

Total
273.8

 
241.0

 
575.2

 
516.4

Electric Operations
 
 
 
 
 
 
 
Unaffiliated
384.9

 
377.2

 
762.3

 
730.1

Intersegment
0.2

 
0.2

 
0.4

 
0.4

Total
385.1

 
377.4

 
762.7

 
730.5

Corporate and Other
 
 
 
 
 
 
 
Unaffiliated
12.7

 
8.3

 
26.3

 
10.5

Intersegment
110.0

 
115.3

 
231.7

 
226.0

Total
122.7

 
123.6

 
258.0

 
236.5

Eliminations
(141.7
)
 
(147.1
)
 
(306.8
)
 
(300.6
)
Consolidated Gross Revenues
$
1,212.3

 
$
1,038.8

 
$
3,006.6

 
$
2,687.0

Operating Income (Loss)
 
 
 
 
 
 
 
Gas Distribution Operations
$
50.0

 
$
43.4

 
$
284.1

 
$
253.0

Columbia Pipeline Group Operations
88.8

 
91.5

 
222.3

 
230.1

Electric Operations
59.5

 
70.3

 
124.7

 
116.5

Corporate and Other
(4.8
)
 
(0.2
)
 
(9.5
)
 
2.4

Consolidated Operating Income
$
193.5

 
$
205.0

 
$
621.6

 
$
602.0