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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited) [Text Block]
QUARTERLY FINANCIAL DATA (UNAUDITED)

Information for any one quarterly period is not necessarily indicative of the results which may be expected for the year.
Quarter Ended
Mar. 31

Jun. 30

Sept. 30

Dec. 31

Millions Except Earnings Per Share
 
 
 
 
2016
 
 
 
 
Operating Revenue

$333.8


$314.8


$349.6


$341.5

Operating Income

$66.8


$42.2


$53.4


$61.1

Net Income Attributable to ALLETE

$45.9


$24.8


$40.3


$44.3

Earnings Per Share of Common Stock
 
 
 
 
Basic

$0.93


$0.50


$0.82


$0.89

Diluted

$0.93


$0.50


$0.81


$0.89

2015
 
 
 
 
Operating Revenue

$320.0


$323.3


$462.5


$380.6

Operating Income

$56.4


$39.5


$85.2


$29.6

Net Income Attributable to ALLETE

$39.9


$22.5


$60.4


$18.3

Earnings Per Share of Common Stock
 
 
 
 
Basic

$0.85


$0.46


$1.24


$0.37

Diluted

$0.85


$0.46


$1.23


$0.37