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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2012
Business Segments [Abstract]  
Business Segments [Table Text Block]
 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2011
 
 
 
Operating Revenue

$928.2


$851.9


$76.3

Fuel and Purchased Power Expense
306.6

306.6

—

Operating and Maintenance Expense
381.2

301.5

79.7

Depreciation Expense
90.4

85.4

5.0

Operating Income (Loss)
150.0

158.4

(8.4
)
Interest Expense
(43.6
)
(35.8
)
(7.8
)
Equity Earnings in ATC
18.4

18.4

—

Other Income
4.4

2.6

1.8

Income (Loss) Before Non-Controlling Interest and Income Taxes
129.2

143.6

(14.4
)
Income Tax Expense (Benefit)
35.6

43.2

(7.6
)
Net Income (Loss)
93.6

100.4

(6.8
)
Less: Non-Controlling Interest in Subsidiaries
(0.2
)
—

(0.2
)
Net Income (Loss) Attributable to ALLETE

$93.8


$100.4

$(6.6)
Total Assets

$2,876.0


$2,579.8


$296.2

Capital Additions

$246.8


$228.0


$18.8

 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2010
 
 
 
Operating Revenue

$907.0


$835.5


$71.5

Fuel and Purchased Power Expense
325.1

325.1

—

Operating and Maintenance Expense
365.6

292.3

73.3

Depreciation Expense
80.5

76.1

4.4

Operating Income (Loss)
135.8

142.0

(6.2
)
Interest Expense
(39.2
)
(32.3
)
(6.9
)
Equity Earnings in ATC
17.9

17.9

—

Other Income
4.6

3.8

0.8

Income (Loss) Before Non-Controlling Interest and Income Taxes
119.1

131.4

(12.3
)
Income Tax Expense (Benefit)
44.3

51.6

(7.3
)
Net Income (Loss)
74.8

79.8

(5.0
)
Less: Non-Controlling Interest in Subsidiaries
(0.5
)
—

(0.5
)
Net Income (Loss) Attributable to ALLETE

$75.3


$79.8

$(4.5)
Total Assets

$2,609.1


$2,375.4


$233.7

Capital Additions

$260.0


$256.4


$3.6

 
Consolidated
Regulated Operations
Investments and Other
Millions
 
 
 
2012
 
 
 
Operating Revenue

$961.2


$874.4


$86.8

Fuel and Purchased Power Expense
308.7

308.7

—

Operating and Maintenance Expense
397.1

310.0

87.1

Depreciation Expense
100.2

93.9

6.3

Operating Income (Loss)
155.2

161.8

(6.6
)
Interest Expense
(45.5
)
(39.8
)
(5.7
)
Equity Earnings in ATC
19.4

19.4

—

Other Income
6.0

5.1

0.9

Income (Loss) Before Non-Controlling Interest and Income Taxes
135.1

146.5

(11.4
)
Income Tax Expense (Benefit)
38.0

50.4

(12.4
)
Net Income
97.1

96.1

1.0

Less: Non-Controlling Interest in Subsidiaries
—

—

—

Net Income Attributable to ALLETE

$97.1


$96.1


$1.0

Total Assets

$3,253.4


$2,962.4


$291.0

Capital Additions

$432.2


$418.2


$14.0