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Investment in ATC (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jan. 31, 2012
ALLETE's Investment in ATC [Roll Forward] |  |  |  |
Equity Investment Beginning Balance | $ 93.3 | $ 88.4 |  |
Cash Investments | 2.0 | 1.6 |  |
Equity Earnings in ATC | 18.4 | 17.9 | 17.5 |
Distributed ATC Earnings | (14.8) | (14.6) |  |
Equity Investment Ending Balance | 98.9 | 93.3 | 88.4 |
Balance Sheet Data [Abstract] |  |  |  |
Current Assets | 58.7 | 59.9 |  |
Non-Current Assets | 3,053.7 | 2,888.4 |  |
Total Assets | 3,112.4 | 2,948.3 |  |
Current Liabilities | 298.5 | 428.4 |  |
Long-Term Debt | 1,400.0 | 1,175.0 |  |
Other Non-Current Liabilities | 82.6 | 84.9 |  |
Members' Equity | 1,331.3 | 1,260.0 |  |
Total Liabilities and Members' Equity | 3,112.4 | 2,948.3 |  |
Income Statement Data [Abstract] |  |  |  |
Revenue | 567.2 | 556.7 | 521.5 |
Operating Expense | 261.6 | 251.1 | 230.3 |
Other Expense | 81.7 | 85.9 | 77.8 |
Net Income | 223.9 | 219.7 | 213.4 |
ALLETE's Equity in Net Income | 18.4 | 17.9 | 17.5 |
Investment in ATC [Abstract] |  |  |  |
Equity Method Investment, Expected Future Investment | 3 |  |  |
Equity Method Investment - Additional Investment Amount |  |  |  | $ 0.8
Equity Method Investment, Approved Return on Common Equity | 12.20% |  |  |
Equity Method Investment, Ownership Percentage | 8.00% |  |  |

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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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