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Business Segments (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | $ 226.9 | $ 224.1 | $ 689.0 | $ 668.9 |
Fuel and Purchased Power Expense | 74.8 | 79.0 | 229.8 | 233.1 |
Operating and Maintenance Expense | 90.5 | 89.8 | 276.3 | 262.9 |
Depreciation Expense | 22.7 | 20.0 | 67.1 | 59.8 |
Operating Income (Loss) | 38.9 | 35.3 | 115.8 | 113.1 |
Interest Expense | (10.9) | (9.7) | (32.6) | (28.1) |
Equity Earnings in ATC | 4.7 | 4.5 | 13.7 | 13.4 |
Other Income (Expense) | 0.5 | 0.6 | 2.3 | 3.8 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | 33.2 | 30.7 | 99.2 | 102.2 |
Income Tax Expense (Benefit) | 12.7 | 11.2 | 24.7 | 40.5 |
Net Income (Loss) | 20.5 | 19.5 | 74.5 | 61.7 |
Less: Non-Controlling Interest in Subsidiaries | 0 | (0.1) | (0.2) | (0.3) |
Net Income (Loss) Attributable to ALLETE | 20.5 | 19.6 | 74.7 | 62.0 |
Total Assets | 2,754.4 | 2,579.1 | 2,754.4 | 2,579.1 | 2,609.1
Property, Plant and Equipment - Net | 1,902.1 | 1,742.6 | 1,902.1 | 1,742.6 | 1,805.6
Accumulated Depreciation | 1,079.0 | 1,022.2 | 1,079.0 | 1,022.2 |
Capital Additions |  |  | 143.5 | 175.5 |
Regulated Operations [Member] |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 207.4 | 204.8 | 632.2 | 615.0 |
Fuel and Purchased Power Expense | 74.8 | 79.0 | 229.8 | 233.1 |
Operating and Maintenance Expense | 70.4 | 70.2 | 218.8 | 209.3 |
Depreciation Expense | 21.4 | 18.9 | 63.5 | 56.6 |
Operating Income (Loss) | 40.8 | 36.7 | 120.1 | 116.0 |
Interest Expense | (9.2) | (8.0) | (26.9) | (23.3) |
Equity Earnings in ATC | 4.7 | 4.5 | 13.7 | 13.4 |
Other Income (Expense) | 0.6 | 1.3 | 1.8 | 3.6 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | 36.9 | 34.5 | 108.7 | 109.7 |
Income Tax Expense (Benefit) | 13.1 | 12.4 | 28.2 | 44.5 |
Net Income (Loss) | 23.8 | 22.1 | 80.5 | 65.2 |
Less: Non-Controlling Interest in Subsidiaries | 0 | 0 | 0 | 0 |
Net Income (Loss) Attributable to ALLETE | 23.8 | 22.1 | 80.5 | 65.2 |
Total Assets | 2,436.0 | 2,299.7 | 2,436.0 | 2,299.7 |
Property, Plant and Equipment - Net | 1,847.1 | 1,698.1 | 1,847.1 | 1,698.1 |
Accumulated Depreciation | 1,028.6 | 973.2 | 1,028.6 | 973.2 |
Capital Additions |  |  | 128.4 | 174.3 |
Investments and Other [Member] |  |  |  |  |
Business Segments [Line Items] |  |  |  |  |
Operating Revenue | 19.5 | 19.3 | 56.8 | 53.9 |
Fuel and Purchased Power Expense | 0 | 0 | 0 | 0 |
Operating and Maintenance Expense | 20.1 | 19.6 | 57.5 | 53.6 |
Depreciation Expense | 1.3 | 1.1 | 3.6 | 3.2 |
Operating Income (Loss) | (1.9) | (1.4) | (4.3) | (2.9) |
Interest Expense | (1.7) | (1.7) | (5.7) | (4.8) |
Equity Earnings in ATC | 0 | 0 | 0 | 0 |
Other Income (Expense) | (0.1) | (0.7) | 0.5 | 0.2 |
Income (Loss) Before Non-Controlling Interest and Income Taxes | (3.7) | (3.8) | (9.5) | (7.5) |
Income Tax Expense (Benefit) | (0.4) | (1.2) | (3.5) | (4.0) |
Net Income (Loss) | (3.3) | (2.6) | (6.0) | (3.5) |
Less: Non-Controlling Interest in Subsidiaries | 0 | (0.1) | (0.2) | (0.3) |
Net Income (Loss) Attributable to ALLETE | (3.3) | (2.5) | (5.8) | (3.2) |
Total Assets | 318.4 | 279.4 | 318.4 | 279.4 |
Property, Plant and Equipment - Net | 55.0 | 44.5 | 55.0 | 44.5 |
Accumulated Depreciation | 50.4 | 49.0 | 50.4 | 49.0 |
Capital Additions |  |  | $ 15.1 | $ 1.2 |

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- Definition Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: 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 5: 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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