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Business Segment Information
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Business Segment Information
Business Segment Information
At September 30, 2016, NiSource’s operations are divided into two primary reportable 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)
2016
 
2015
 
2016
 
2015
Revenues
 
 
 
 
 
 
 
Gas Distribution Operations
 
 
 
 
 
 
 
Unaffiliated
$
392.4

 
$
384.6

 
$
1,935.6

 
$
2,349.3

Intersegment
3.1

 
0.1

 
9.6

 
0.4

Total
395.5

 
384.7

 
1,945.2

 
2,349.7

Electric Operations
 
 
 
 
 
 
 
Unaffiliated
465.4

 
428.4

 
1,249.2

 
1,199.5

Intersegment
0.4

 
0.2

 
0.6

 
0.6

Total
465.8

 
428.6

 
1,249.8

 
1,200.1

Corporate and Other
 
 
 
 
 
 
 
Unaffiliated
3.5

 
4.2

 
10.7

 
5.2

Intersegment
100.5

 
94.1

 
298.1

 
288.1

Total
104.0

 
98.3

 
308.8

 
293.3

Eliminations
(104.0
)
 
(94.4
)
 
(308.3
)
 
(289.1
)
Consolidated Gross Revenues
$
861.3

 
$
817.2

 
$
3,195.5

 
$
3,554.0

Operating Income (Loss)
 
 
 
 
 
 
 
Gas Distribution Operations
$
4.3

 
$
20.0

 
$
392.7

 
$
394.9

Electric Operations
112.8

 
98.5

 
251.5

 
214.2

Corporate and Other
(3.4
)
 
(8.8
)
 
(10.9
)
 
(28.7
)
Consolidated Operating Income
$
113.7

 
$
109.7

 
$
633.3

 
$
580.4