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Investment in ATC (Tables)
3 Months Ended
Mar. 31, 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
0.4

Equity in ATC Earnings
5.2

Distributed ATC Earnings
(3.9
)
Equity Investment Balance as of March 31, 2013

$109.0

ATC Summarized Financial Data [Table Text Block]
ATC’s summarized financial data for the quarters ended March 31, 2013 and 2012, is as follows:
 
Quarter Ended
ATC Summarized Financial Data
March 31,
Income Statement Data
2013
 
2012
Millions
 
 
 
Revenue

$151.8

 
$147.7
Operating Expense
69.8

 
69.6
Other Expense
21.5

 
20.0
Net Income
$60.5
 
$58.1
ALLETE’s Equity in Net Income

$5.2

 
$4.6