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Investment in ATC (Tables)
6 Months Ended
Jun. 30, 2011
Equity Investments [Abstract]  
Schedule of Equity Method Investments

ALLETE's Investment in ATC
 
Millions
 
Equity Investment Balance as of December 31, 2010
$93.3
Cash Investments
1.4
Equity in ATC Earnings
9.0
Distributed ATC Earnings
(7.4)
Equity Investment Balance as of June 30, 2011
$96.3