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Investment in ATC (Tables)
6 Months Ended
Jun. 30, 2013
Investment in ATC [Abstract]  
ALLETE's Investment in ATC [Table Text Block]
ALLETE’s Investment in ATC
 
Millions
 
Equity Investment Balance as of December 31, 2012

$107.3

Cash Investments
1.6

Equity in ATC Earnings
10.2

Distributed ATC Earnings
(7.9
)
Equity Investment Balance as of June 30, 2013

$111.2

ATC Summarized Financial Data [Table Text Block]
ATC’s summarized financial data for the quarters and six months ended June 30, 2013 and 2012, is as follows:
 
Quarter Ended
 
Six Months Ended
ATC Summarized Financial Data
June 30,
 
June 30,
Income Statement Data
2013
 
2012
 
2013
 
2012
Millions
 
 
 
 
 
 
 
Revenue

$152.1

 
$152.2
 

$303.9

 

$299.8

Operating Expense
69.9

 
71.8
 
139.7

 
141.3

Other Expense
20.9

 
21.1
 
42.4

 
41.1

Net Income

$61.3

 
$59.3
 

$121.8

 

$117.4

ALLETE’s Equity in Net Income

$5.0

 
$4.8
 

$10.2

 

$9.4