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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Segments [Line Items]                      
Operating Revenue $ 268.0 $ 251.0 $ 235.6 $ 263.8 $ 256.0 $ 248.8 $ 216.4 $ 240.0 $ 1,018.4 $ 961.2 $ 928.2
Fuel and Purchased Power Expense                 334.8 308.7 306.6
Operating and Maintenance Expense                 412.9 397.1 381.2
Depreciation Expense                 116.6 100.2 90.4
Operating Income (Loss) 46.9 38.4 24.4 44.4 47.9 45.6 23.3 38.4 154.1 155.2 150.0
Interest Expense                 (50.3) (45.5) (43.6)
Equity Earnings in ATC                 20.3 19.4 18.4
Other Income                 9.3 6.0 4.4
Income (Loss) Before Non-Controlling Interest and Income Taxes                 133.4 135.1 129.2
Income Tax Expense (Benefit)                 28.7 38.0 35.6
Net Income (Loss)                 104.7 97.1 93.6
Less: Non-Controlling Interest in Subsidiaries                 0 0 (0.2)
Net Income (Loss) Attributable to ALLETE 33.0 25.2 14.0 32.5 28.9 29.4 14.4 24.4 104.7 97.1 93.8
Total Assets 3,476.8       3,253.4       3,476.8 3,253.4 2,876.0
Capital Additions                 339.5 432.2 246.8
Regulated Operations [Member]
                      
Business Segments [Line Items]                      
Operating Revenue                 925.5 874.4 851.9
Fuel and Purchased Power Expense                 334.8 308.7 306.6
Operating and Maintenance Expense                 322.4 310.0 301.5
Depreciation Expense                 110.2 93.9 85.4
Operating Income (Loss)                 158.1 161.8 158.4
Interest Expense                 (42.1) (39.8) (35.8)
Equity Earnings in ATC                 20.3 19.4 18.4
Other Income                 4.7 5.1 2.6
Income (Loss) Before Non-Controlling Interest and Income Taxes                 141.0 146.5 143.6
Income Tax Expense (Benefit)                 36.1 50.4 43.2
Net Income (Loss)                 104.9 96.1 100.4
Less: Non-Controlling Interest in Subsidiaries                     0
Net Income (Loss) Attributable to ALLETE                     100.4
Total Assets 3,160.8       2,962.4       3,160.8 2,962.4 2,579.8
Capital Additions                 326.3 418.2 228.0
Investments and Other [Member]
                      
Business Segments [Line Items]                      
Number of acres of land in Minnesota (in acres) 5,000               5,000    
Operating Revenue                 92.9 86.8 76.3
Fuel and Purchased Power Expense                 0 0 0
Operating and Maintenance Expense                 90.5 87.1 79.7
Depreciation Expense                 6.4 6.3 5.0
Operating Income (Loss)                 (4.0) (6.6) (8.4)
Interest Expense                 (8.2) (5.7) (7.8)
Equity Earnings in ATC                 0 0 0
Other Income                 4.6 0.9 1.8
Income (Loss) Before Non-Controlling Interest and Income Taxes                 (7.6) (11.4) (14.4)
Income Tax Expense (Benefit)                 (7.4) (12.4) (7.6)
Net Income (Loss)                 (0.2) 1.0 (6.8)
Less: Non-Controlling Interest in Subsidiaries                     (0.2)
Net Income (Loss) Attributable to ALLETE                     (6.6)
Total Assets 316.0       291.0       316.0 291.0 296.2
Capital Additions                 $ 13.2 $ 14.0 $ 18.8