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Business Segments | 6 Months Ended
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Jun. 30, 2013
Business Segments [Abstract] |
Business Segments [Text Block] | BUSINESS SEGMENTS Regulated Operations includes our regulated utilities, Minnesota Power and SWL&P, as well as our investment in ATC, a Wisconsin-based regulated utility that owns and maintains electric transmission assets in parts of Wisconsin, Michigan, Minnesota and Illinois. Investments and Other is comprised primarily of BNI Coal, our coal mining operations in North Dakota, ALLETE Properties, our Florida real estate investment, and ALLETE Clean Energy, our business aimed at developing or acquiring capital projects that create energy solutions via wind, solar, biomass, midstream gas and oil infrastructure, among other energy-related projects. This segment also includes other business development and corporate expenditures, a small amount of non-rate base generation, approximately 6,000 acres of land in Minnesota, and earnings on cash and investments.
| Consolidated | Regulated Operations | Investments and Other
Millions |  |  |
For the Quarter Ended June 30, 2013 |  |  |
Operating Revenue |  | $235.6 |  |  | $215.8 |  |  | $19.8 |
Fuel and Purchased Power Expense | 78.7 |  | 78.7 |  | — |
Operating and Maintenance Expense | 103.8 |  | 82.8 |  | 21.0 |
Depreciation Expense | 28.7 |  | 27.1 |  | 1.6 |
Operating Income (Loss) | 24.4 |  | 27.2 |  | (2.8 | )
Interest Expense | (12.8 | ) | (10.4 | ) | (2.4 | )
Equity Earnings in ATC | 5.0 |  | 5.0 |  | — |
Other Income | 1.5 |  | 1.1 |  | 0.4 |
Income (Loss) Before Income Taxes | 18.1 |  | 22.9 |  | (4.8 | )
Income Tax Expense (Benefit) | 4.1 |  | 6.6 |  | (2.5 | )
Net Income (Loss) |  | $14.0 |  |  | $16.3 |  | $(2.3)
| Consolidated | Regulated Operations | Investments and Other
Millions |  |  |
For the Quarter Ended June 30, 2012 |  |  |
Operating Revenue |  | $216.4 |  |  | $197.0 |  |  | $19.4 |
Fuel and Purchased Power Expense | 72.1 |  | 72.1 |  | — |
Operating and Maintenance Expense | 96.2 |  | 76.1 |  | 20.1 |
Depreciation Expense | 24.8 |  | 23.4 |  | 1.4 |
Operating Income (Loss) | 23.3 |  | 25.4 |  | (2.1 | )
Interest Expense | (10.1 | ) | (9.9 | ) | (0.2 | )
Equity Earnings in ATC | 4.8 |  | 4.8 |  | — |
Other Income | 1.2 |  | 1.2 |  | — |
Income (Loss) Before Income Taxes | 19.2 |  | 21.5 |  | (2.3 | )
Income Tax Expense (Benefit) | 4.8 |  | 7.1 |  | (2.3 | )
Net Income |  | $14.4 |  |  | $14.4 |  | — |
| Consolidated | Regulated Operations | Investments and Other
Millions |  |  |
For the Six Months Ended June 30, 2013 |  |  |
Operating Revenue |  | $499.4 |  |  | $457.2 |  |  | $42.2 |
Fuel and Purchased Power Expense | 165.2 |  | 165.2 |  | — |
Operating and Maintenance Expense | 208.5 |  | 165.0 |  | 43.5 |
Depreciation Expense | 56.9 |  | 53.9 |  | 3.0 |
Operating Income (Loss) | 68.8 |  | 73.1 |  | (4.3 | )
Interest Expense | (25.1 | ) | (21.1 | ) | (4.0 | )
Equity Earnings in ATC | 10.2 |  | 10.2 |  | — |
Other Income | 4.2 |  | 2.2 |  | 2.0 |
Income (Loss) Before Income Taxes | 58.1 |  | 64.4 |  | (6.3 | )
Income Tax Expense (Benefit) | 11.6 |  | 16.0 |  | (4.4 | )
Net Income (Loss) |  | $46.5 |  |  | $48.4 |  | $(1.9)
As of June 30, 2013 |  |  |
Total Assets |  | $3,350.9 |  |  | $2,997.0 |  |  | $353.9 |
Property, Plant and Equipment – Net |  | $2,397.2 |  |  | $2,329.6 |  |  | $67.6 |
Accumulated Depreciation |  | $1,202.8 |  |  | $1,143.2 |  |  | $59.6 |
Capital Additions |  | $100.2 |  |  | $97.2 |  |  | $3.0 |
| Consolidated |  | Regulated Operations |  | Investments and Other
Millions |  |  |  |  |
For the Six Months Ended June 30, 2012 |  |  |  |  |
Operating Revenue |  | $456.4 |  |  |  | $415.6 |  |  |  | $40.8 |
Fuel and Purchased Power Expense | 149.2 |  |  | 149.2 |  |  | — |
Operating and Maintenance Expense | 196.1 |  |  | 154.2 |  |  | 41.9 |
Depreciation Expense | 49.4 |  |  | 46.6 |  |  | 2.8 |
Operating Income (Loss) | 61.7 |  |  | 65.6 |  |  | (3.9 | )
Interest Expense | (21.1 | ) |  | (19.5 | ) |  | (1.6 | )
Equity Earnings in ATC | 9.4 |  |  | 9.4 |  |  | — |
Other Income (Expense) | 1.9 |  |  | 2.0 |  |  | (0.1 | )
Income (Loss) Before Income Taxes | 51.9 |  |  | 57.5 |  |  | (5.6 | )
Income Tax Expense (Benefit) | 13.1 |  |  | 18.7 |  |  | (5.6 | )
Net Income |  | $38.8 |  |  |  | $38.8 |  |  | — |
As of June 30, 2012 |  |  |  |  |  |  |  |
Total Assets |  | $2,962.2 |  |  |  | $2,755.4 |  |  |  | $206.8 |
Property, Plant and Equipment – Net |  | $2,177.5 |  |  |  | $2,119.9 |  |  |  | $57.6 |
Accumulated Depreciation |  | $1,124.5 |  |  |  | $1,070.1 |  |  |  | $54.4 |
Capital Additions |  | $235.1 |  |  |  | $232.3 |  |  |  | $2.8 |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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