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Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | $ 216.4 | $ 219.9 | $ 456.4 | $ 462.1 |
Fuel and Purchased Power Expense | 72.1 | 76.0 | 149.2 | 155.0 |
Operating and Maintenance Expense | 96.2 | 95.7 | 196.1 | 185.8 |
Depreciation Expense | 24.8 | 22.1 | 49.4 | 44.4 |
Operating Income (Loss) | 23.3 | 26.1 | 61.7 | 76.9 |
Interest Expense | (10.1) | (11.0) | (21.1) | (21.7) |
Equity Earnings in ATC | 4.8 | 4.6 | 9.4 | 9.0 |
Other Income | 1.2 | 1.0 | 1.9 | 1.8 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | 19.2 | 20.7 | 51.9 | 66.0 |
Income Tax Expense (Benefit) | 4.8 | 3.8 | 13.1 | 12.0 |
Net Income (Loss) | 14.4 | 16.9 | 38.8 | 54.0 |
Less: Non-Controlling Interest in Subsidiaries | 0 | (0.1) | 0 | (0.2) |
Net Income Attributable to ALLETE | 14.4 | 17.0 | 38.8 | 54.2 |
Total Assets | 2,962.2 | 2,645.5 | 2,962.2 | 2,645.5 | 2,876.0
Property, Plant and Equipment - Net | 2,177.5 | 1,861.1 | 2,177.5 | 1,861.1 | 1,982.7
Accumulated Depreciation | 1,124.5 | 1,062.6 | 1,124.5 | 1,062.6 |
Capital Additions |  |  | 235.1 | 79.7 |
Regulated Operations [Member] |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 197.0 | 201.8 | 415.6 | 424.8 |
Fuel and Purchased Power Expense | 72.1 | 76.0 | 149.2 | 155.0 |
Operating and Maintenance Expense | 76.1 | 77.2 | 154.2 | 148.4 |
Depreciation Expense | 23.4 | 20.9 | 46.6 | 42.1 |
Operating Income (Loss) | 25.4 | 27.7 | 65.6 | 79.3 |
Interest Expense | (9.9) | (9.1) | (19.5) | (17.7) |
Equity Earnings in ATC | 4.8 | 4.6 | 9.4 | 9.0 |
Other Income | 1.2 | 0.6 | 2.0 | 1.2 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | 21.5 | 23.8 | 57.5 | 71.8 |
Income Tax Expense (Benefit) | 7.1 | 5.5 | 18.7 | 15.1 |
Net Income (Loss) | 14.4 | 18.3 | 38.8 | 56.7 |
Less: Non-Controlling Interest in Subsidiaries | 0 | 0 | 0 | 0 |
Net Income Attributable to ALLETE | 14.4 | 18.3 | 38.8 | 56.7 |
Total Assets | 2,755.4 | 2,381.6 | 2,755.4 | 2,381.6 |
Property, Plant and Equipment - Net | 2,119.9 | 1,808.9 | 2,119.9 | 1,808.9 |
Accumulated Depreciation | 1,070.1 | 1,011.3 | 1,070.1 | 1,011.3 |
Capital Additions |  |  | 232.3 | 69.3 |
Investments and Other [Member] |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Land available-for-sale in Minnesota (in acres) | 5,500 |  | 5,500 |  |
Operating Revenue | 19.4 | 18.1 | 40.8 | 37.3 |
Fuel and Purchased Power Expense | 0 | 0 | 0 | 0 |
Operating and Maintenance Expense | 20.1 | 18.5 | 41.9 | 37.4 |
Depreciation Expense | 1.4 | 1.2 | 2.8 | 2.3 |
Operating Income (Loss) | (2.1) | (1.6) | (3.9) | (2.4) |
Interest Expense | (0.2) | (1.9) | (1.6) | (4.0) |
Equity Earnings in ATC | 0 | 0 | 0 | 0 |
Other Income | 0 | 0.4 | (0.1) | 0.6 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | (2.3) | (3.1) | (5.6) | (5.8) |
Income Tax Expense (Benefit) | (2.3) | (1.7) | (5.6) | (3.1) |
Net Income (Loss) | 0 | (1.4) | 0 | (2.7) |
Less: Non-Controlling Interest in Subsidiaries | 0 | (0.1) | 0 | (0.2) |
Net Income Attributable to ALLETE | 0 | (1.3) | 0 | (2.5) |
Total Assets | 206.8 | 263.9 | 206.8 | 263.9 |
Property, Plant and Equipment - Net | 57.6 | 52.2 | 57.6 | 52.2 |
Accumulated Depreciation | 54.4 | 51.3 | 54.4 | 51.3 |
Capital Additions |  |  | $ 2.8 | $ 10.4 |

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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -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 FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
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- Definition The total amount of operating revenues recognized during the period. + References No definition available. + Details
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- Definition Discloses the amount of operating expense for the period related to depreciation and amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Discloses the amount of operating expense for the period for routine plant maintenance, repairs and operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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