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

$235.6


$215.8


$19.8

Fuel and Purchased Power Expense
78.7

78.7

—

Operating and Maintenance Expense
103.8

82.8

21.0

Depreciation Expense
28.7

27.1

1.6

Operating Income (Loss)
24.4

27.2

(2.8
)
Interest Expense
(12.8
)
(10.4
)
(2.4
)
Equity Earnings in ATC
5.0

5.0

—

Other Income
1.5

1.1

0.4

Income (Loss) Before Income Taxes
18.1

22.9

(4.8
)
Income Tax Expense (Benefit)
4.1

6.6

(2.5
)
Net Income (Loss)

$14.0


$16.3

$(2.3)

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

$216.4


$197.0


$19.4

Fuel and Purchased Power Expense
72.1

72.1

—

Operating and Maintenance Expense
96.2

76.1

20.1

Depreciation Expense
24.8

23.4

1.4

Operating Income (Loss)
23.3

25.4

(2.1
)
Interest Expense
(10.1
)
(9.9
)
(0.2
)
Equity Earnings in ATC
4.8

4.8

—

Other Income
1.2

1.2

—

Income (Loss) Before Income Taxes
19.2

21.5

(2.3
)
Income Tax Expense (Benefit)
4.8

7.1

(2.3
)
Net Income

$14.4


$14.4

—

 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
For the Six Months Ended June 30, 2013
 
 
 
Operating Revenue

$499.4


$457.2


$42.2

Fuel and Purchased Power Expense
165.2

165.2

—

Operating and Maintenance Expense
208.5

165.0

43.5

Depreciation Expense
56.9

53.9

3.0

Operating Income (Loss)
68.8

73.1

(4.3
)
Interest Expense
(25.1
)
(21.1
)
(4.0
)
Equity Earnings in ATC
10.2

10.2

—

Other Income
4.2

2.2

2.0

Income (Loss) Before Income Taxes
58.1

64.4

(6.3
)
Income Tax Expense (Benefit)
11.6

16.0

(4.4
)
Net Income (Loss)

$46.5


$48.4

$(1.9)
 
 
 
 
As of June 30, 2013
 
 
 
Total Assets

$3,350.9


$2,997.0


$353.9

Property, Plant and Equipment – Net

$2,397.2


$2,329.6


$67.6

Accumulated Depreciation

$1,202.8


$1,143.2


$59.6

Capital Additions

$100.2


$97.2


$3.0


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

$456.4

 

$415.6

 

$40.8

Fuel and Purchased Power Expense
149.2

 
149.2

 
—

Operating and Maintenance Expense
196.1

 
154.2

 
41.9

Depreciation Expense
49.4

 
46.6

 
2.8

Operating Income (Loss)
61.7

 
65.6

 
(3.9
)
Interest Expense
(21.1
)
 
(19.5
)
 
(1.6
)
Equity Earnings in ATC
9.4

 
9.4

 
—

Other Income (Expense)
1.9

 
2.0

 
(0.1
)
Income (Loss) Before Income Taxes
51.9

 
57.5

 
(5.6
)
Income Tax Expense (Benefit)
13.1

 
18.7

 
(5.6
)
Net Income

$38.8

 

$38.8

 
—

 
 
 
 
 
 
As of June 30, 2012
 

 
 

 
 

Total Assets

$2,962.2

 

$2,755.4

 

$206.8

Property, Plant and Equipment – Net

$2,177.5

 

$2,119.9

 

$57.6

Accumulated Depreciation

$1,124.5

 

$1,070.1

 

$54.4

Capital Additions

$235.1

 

$232.3

 

$2.8