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Business Segment Information (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Schedule Of Operating Income Derived From Revenues And Expenses By 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