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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2013
Business Segments [Abstract]  
Business Segments [Table Text Block]
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Quarter Ended September 30, 2013
 
 
 
Operating Revenue

$251.0


$226.4


$24.6

Fuel and Purchased Power Expense
80.5

80.5

—

Operating and Maintenance Expense
102.7

78.6

24.1

Depreciation Expense
29.4

27.9

1.5

Operating Income (Loss)
38.4

39.4

(1.0
)
Interest Expense
(12.7
)
(10.4
)
(2.3
)
Equity Earnings in ATC
4.9

4.9

—

Other Income
3.3

1.2

2.1

Income (Loss) Before Income Taxes
33.9

35.1

(1.2
)
Income Tax Expense (Benefit)
8.7

10.5

(1.8
)
Net Income

$25.2


$24.6


$0.6


 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Quarter Ended September 30, 2012
 
 
 
Operating Revenue

$248.8


$226.4


$22.4

Fuel and Purchased Power Expense
79.5

79.5

—

Operating and Maintenance Expense
98.7

76.4

22.3

Depreciation Expense
25.0

23.5

1.5

Operating Income (Loss)
45.6

47.0

(1.4
)
Interest Expense
(12.3
)
(10.2
)
(2.1
)
Equity Earnings in ATC
4.9

4.9

—

Other Income
1.5

1.5

—

Income (Loss) Before Income Taxes
39.7

43.2

(3.5
)
Income Tax Expense (Benefit)
10.3

13.9

(3.6
)
Net Income

$29.4


$29.3

$0.1
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Nine Months Ended September 30, 2013
 
 
 
Operating Revenue

$750.4


$683.6


$66.8

Fuel and Purchased Power Expense
245.7

245.7

—

Operating and Maintenance Expense
311.2

243.6

67.6

Depreciation Expense
86.3

81.8

4.5

Operating Income (Loss)
107.2

112.5

(5.3
)
Interest Expense
(37.8
)
(31.5
)
(6.3
)
Equity Earnings in ATC
15.1

15.1

—

Other Income
7.5

3.4

4.1

Income (Loss) Before Income Taxes
92.0

99.5

(7.5
)
Income Tax Expense (Benefit)
20.3

26.5

(6.2
)
Net Income (Loss)

$71.7


$73.0

$(1.3)
 
 
 
 
As of September 30, 2013
 
 
 
Total Assets

$3,463.9


$3,086.3


$377.6

Property, Plant and Equipment – Net

$2,456.1


$2,384.1


$72.0

Accumulated Depreciation

$1,225.3


$1,165.8


$59.5

Capital Additions

$186.4


$177.6


$8.8


 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Nine Months Ended September 30, 2012
 
 
 
Operating Revenue

$705.2


$642.0


$63.2

Fuel and Purchased Power Expense
228.7

228.7

—

Operating and Maintenance Expense
294.8

230.6

64.2

Depreciation Expense
74.4

70.1

4.3

Operating Income (Loss)
107.3

112.6

(5.3
)
Interest Expense
(33.4
)
(29.7
)
(3.7
)
Equity Earnings in ATC
14.3

14.3

—

Other Income (Expense)
3.4

3.5

(0.1
)
Income (Loss) Before Income Taxes
91.6

100.7

(9.1
)
Income Tax Expense (Benefit)
23.4

32.6

(9.2
)
Net Income

$68.2


$68.1

$0.1
 
 
 
 
As of September 30, 2012
 

 

 

Total Assets

$3,138.1


$2,830.9


$307.2

Property, Plant and Equipment – Net

$2,239.9


$2,180.8


$59.1

Accumulated Depreciation

$1,146.7


$1,091.5


$55.2

Capital Additions

$318.3


$312.6


$5.7