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Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Business Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of acres of land available-for-sale (in acres) | 5,500 |  |  |  |  |  |  |  | 5,500 |  |
Business Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating and Maintenance Expense |  |  |  |  |  |  |  |  | $ 381.2 | $ 365.6 | $ 308.9
Depreciation Expense |  |  |  |  |  |  |  |  | 90.4 | 80.5 | 64.7
Operating Income | 34.2 | 38.9 | 26.1 | 50.8 | 22.7 | 35.3 | 31.7 | 46.1 | 150.0 | 135.8 | 106.0
Interest Expense |  |  |  |  |  |  |  |  | (43.6) | (39.2) | (33.8)
Equity Earnings in ATC |  |  |  |  |  |  |  |  | 18.4 | 17.9 | 17.5
Other Income (Expense) |  |  |  |  |  |  |  |  | 4.4 | 4.6 | 1.8
Income (Loss) Before Non-Controlling Interest and Income Taxes |  |  |  |  |  |  |  |  | 129.2 | 119.1 | 91.5
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 35.6 | 44.3 | 30.8
Net Income (Loss) |  |  |  |  |  |  |  |  | 93.6 | 74.8 | 60.7
Less: Non-Controlling Interest in Subsidiaries |  |  |  |  |  |  |  |  | (0.2) | (0.5) | (0.3)
Net Income (Loss) Attributable to ALLETE | 19.1 | 20.5 | 17.0 | 37.2 | 13.3 | 19.6 | 19.4 | 23.0 | 93.8 | 75.3 | 61.0
Total Assets | 2,876.0 |  |  |  | 2,609.1 |  |  |  | 2,876.0 | 2,609.1 |
Consolidated [Member] |  |  |  |  |  |  |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 766.7
Prior Year Rate Refunds |  |  |  |  |  |  |  |  |  |  | (7.6)
Operating Revenue |  |  |  |  |  |  |  |  | 928.2 | 907.0 | 759.1
Total Operating Revenue |  |  |  |  |  |  |  |  | 928.2 | 907.0 | 759.1
Fuel and Purchased Power Expense |  |  |  |  |  |  |  |  | 306.6 | 325.1 | 279.5
Operating and Maintenance Expense |  |  |  |  |  |  |  |  | 381.2 | 365.6 | 308.9
Depreciation Expense |  |  |  |  |  |  |  |  | 90.4 | 80.5 | 64.7
Operating Income |  |  |  |  |  |  |  |  | 150.0 | 135.8 | 106.0
Interest Expense |  |  |  |  |  |  |  |  | (43.6) | (39.2) | (33.8)
Equity Earnings in ATC |  |  |  |  |  |  |  |  | 18.4 | 17.9 | 17.5
Other Income (Expense) |  |  |  |  |  |  |  |  | 4.4 | 4.6 | 1.8
Income (Loss) Before Non-Controlling Interest and Income Taxes |  |  |  |  |  |  |  |  | 129.2 | 119.1 | 91.5
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 35.6 | 44.3 | 30.8
Net Income (Loss) |  |  |  |  |  |  |  |  | 93.6 | 74.8 | 60.7
Less: Non-Controlling Interest in Subsidiaries |  |  |  |  |  |  |  |  | (0.2) | (0.5) | (0.3)
Net Income (Loss) Attributable to ALLETE |  |  |  |  |  |  |  |  | 93.8 | 75.3 | 61.0
Total Assets | 2,876.0 |  |  |  | 2,609.1 |  |  |  | 2,876.0 | 2,609.1 | 2,393.1
Capital Additions |  |  |  |  |  |  |  |  | 246.8 | 260.0 | 303.7
Regulated Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 689.4
Prior Year Rate Refunds |  |  |  |  |  |  |  |  |  |  | (7.6)
Operating Revenue |  |  |  |  |  |  |  |  | 851.9 | 835.5 | 681.8
Total Operating Revenue |  |  |  |  |  |  |  |  | 851.9 | 835.5 | 681.8
Fuel and Purchased Power Expense |  |  |  |  |  |  |  |  | 306.6 | 325.1 | 279.5
Operating and Maintenance Expense |  |  |  |  |  |  |  |  | 301.5 | 292.3 | 235.8
Depreciation Expense |  |  |  |  |  |  |  |  | 85.4 | 76.1 | 60.2
Operating Income |  |  |  |  |  |  |  |  | 158.4 | 142.0 | 106.3
Interest Expense |  |  |  |  |  |  |  |  | (35.8) | (32.3) | (28.3)
Equity Earnings in ATC |  |  |  |  |  |  |  |  | 18.4 | 17.9 | 17.5
Other Income (Expense) |  |  |  |  |  |  |  |  | 2.6 | 3.8 | 5.8
Income (Loss) Before Non-Controlling Interest and Income Taxes |  |  |  |  |  |  |  |  | 143.6 | 131.4 | 101.3
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 43.2 | 51.6 | 35.4
Net Income (Loss) |  |  |  |  |  |  |  |  | 100.4 | 79.8 | 65.9
Less: Non-Controlling Interest in Subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Income (Loss) Attributable to ALLETE |  |  |  |  |  |  |  |  | 100.4 | 79.8 | 65.9
Total Assets | 2,579.8 |  |  |  | 2,375.4 |  |  |  | 2,579.8 | 2,375.4 | 2,184.0
Capital Additions |  |  |  |  |  |  |  |  | 228.0 | 256.4 | 299.2
Investments and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  |  |  | 77.3
Prior Year Rate Refunds |  |  |  |  |  |  |  |  |  |  | 0
Operating Revenue |  |  |  |  |  |  |  |  | 76.3 | 71.5 | 77.3
Total Operating Revenue |  |  |  |  |  |  |  |  | 76.3 | 71.5 | 77.3
Fuel and Purchased Power Expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating and Maintenance Expense |  |  |  |  |  |  |  |  | 79.7 | 73.3 | 73.1
Depreciation Expense |  |  |  |  |  |  |  |  | 5.0 | 4.4 | 4.5
Operating Income |  |  |  |  |  |  |  |  | (8.4) | (6.2) | (0.3)
Interest Expense |  |  |  |  |  |  |  |  | (7.8) | (6.9) | (5.5)
Equity Earnings in ATC |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Income (Expense) |  |  |  |  |  |  |  |  | 1.8 | 0.8 | (4.0)
Income (Loss) Before Non-Controlling Interest and Income Taxes |  |  |  |  |  |  |  |  | (14.4) | (12.3) | (9.8)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (7.6) | (7.3) | (4.6)
Net Income (Loss) |  |  |  |  |  |  |  |  | (6.8) | (5.0) | (5.2)
Less: Non-Controlling Interest in Subsidiaries |  |  |  |  |  |  |  |  | (0.2) | (0.5) | (0.3)
Net Income (Loss) Attributable to ALLETE |  |  |  |  |  |  |  |  | (6.6) | (4.5) | (4.9)
Total Assets | 296.2 |  |  |  | 233.7 |  |  |  | 296.2 | 233.7 | 209.1
Capital Additions |  |  |  |  |  |  |  |  | $ 18.8 | $ 3.6 | $ 4.5

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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6921930&loc=SL4573702-111684 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=6922042&loc=SL4591552-111686 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=6921628&loc=SL4569616-111683 + Details
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