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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2011
Comprehensive Income (Loss) [Abstract]  
Comprehensive Income (Loss) [Table Text Block]
Comprehensive Income (Loss)
 
 
 
Year Ended December 31
2011
2010
2009
Millions
 
 
 
Net Income

$93.6


$74.8


$60.7

Other Comprehensive Income
 
 
 
    Unrealized Gain (Loss) on Securities
   Net of income taxes of $(0.1), $0.6, and $1.7
(0.3
)
0.8

2.8

    Unrealized Loss on Derivatives
   Net of income taxes of $(0.2), $-, and $-
(0.3
)
—

—

    Defined Benefit Pension and Other Postretirement Plans
   Net of income taxes of $(3.6), $-, and $4.1
(5.1
)
—

6.2

Total Other Comprehensive Income (Loss)
(5.7
)
0.8

9.0

Total Comprehensive Income

$87.9


$75.6


$69.7

Less: Non-Controlling Interest in Subsidiaries
(0.2
)
(0.5
)
(0.3
)
Comprehensive Income Attributable to ALLETE

$88.1


$76.1


$70.0
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Income (Loss)
 
 
As of December 31
2011
2010
Millions
 
 
Unrealized Loss on Securities
$(1.3)
$(1.0)
Unrealized Loss on Derivatives
(0.3
)
—

Defined Benefit Pension and Other Postretirement Plans
(27.3
)
(22.2
)
Total Accumulated Other Comprehensive Loss
$(28.9)
$(23.2)