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Operations and Significant Accounting Policies (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Trade Accounts Receivable [Abstract] |  |  |  |  |  |
Billed | $ 63.7 |  | $ 67.6 |  |  |
Unbilled | 15.6 |  | 18.9 |  |  |
Less: Allowance for Doubtful Accounts | 0.9 |  | 0.9 |  |  |
Total Trade Accounts Receivable | 78.4 |  | 85.6 |  |  |
Income Taxes Receivable | 1.3 | [1] | 13.9 | [1] |  |
Total Accounts Receivable - Net | 79.7 |  | 99.5 |  |  |
Impairement of Long-Lived Assets [Abstract] |  |  |  |  |  |
Land Impairment | 1.7 | [2] | 0 | [2] |  |
Remaining Cost Basis | 3.0 |  |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |
More Likely Than Not Definition | 50.00% |  |  |  |  |
Inventory Disclosure [Abstract] |  |  |  |  |  |
Fuel | 28.6 |  | 22.9 |  |  |
Materials and Supplies | 40.5 |  | 37.1 |  |  |
Total Inventories | 69.1 |  | 60.0 |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |  |
Purchase of Non-Controlling Interest at Book Value | 8.8 |  |  |  |  |
Purchase of Non-Controlling Interest, Shares Issued | 200 |  |  |  |  |
Other Liabilities, Current [Abstract] |  |  |  |  |  |
Customer Deposits | 16.3 | [3] | 2.9 | [3] |  |
Other | 29.3 |  | 30.8 |  |  |
Total Other Current Liabilities | 45.6 |  | 33.7 |  |  |
Other Liabilities, Noncurrent [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | 57.0 |  | 50.3 |  | 44.6 |
Other | 48.1 |  | 43.1 |  |  |
Total Other Non-Current Liabilities | 105.1 |  | 93.4 |  |  |
Prepaid Expense and Other Assets, Current [Abstract] |  |  |  |  |  |
Deferred Fuel Adjustment Clause | 17.5 |  | 20.6 |  |  |
Other | 9.6 |  | 8.0 |  |  |
Total Prepayments and Other Current Assets | 27.1 |  | 28.6 |  |  |
Supplemental Cash Flow Information [Abstract] |  |  |  |  |  |
Cash Paid During the Period for Interest - Net of Amounts Capitalized | 43.2 |  | 35.7 |  | 29.8 |
Cash Received During the Period for Income Taxes | (11.4) | [4] | (54.2) | [4] | (5.6) | [4]
Noncash Investing and Financing Activities [Abstract] |  |  |  |  |  |
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment | 5.9 |  | 7.5 |  | (24.1) |
AFUDC-Equity | 2.5 |  | 4.2 |  | 5.8 |
ALLETE Common Stock Contributed to the Pension Plan | $ (20.0) |  | $ 0 |  | $ (12.0) |
Retail [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers | 144,000 |  |  |  |  |
Electric [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers | 15,000 |  |  |  |  |
Natural Gas [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers | 12,000 |  |  |  |  |
Water [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers | 10,000 |  |  |  |  |
Non-Affiliated Municipal Customers, Municpalities [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers | 16 |  |  |  |  |
Non-Affiliated Municipal Customers, Private Utilities [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers | 1 |  |  |  |  |
[1] | (a)Income Taxes Receivable decreased from 2010 due to the collection of a 2010 NOL carryback claim. (See Note 14. Income Tax Expense.)
[2] | (b)The land impairment charge was a result of an impairment analysis conducted in the fourth quarter of 2011 where the cost basis was reduced to the estimated fair value.
[3] | (a)Higher customer deposits in 2011 were primarily due to a customer security deposit for capital expenditures relating to a transmission project.
[4] | (a)Due to bonus depreciation provisions in 2009 and 2010 federal legislation, NOLs were generated which resulted in little to no estimated tax payments, and refunds were received from NOL carrybacks against prior years' taxable income.

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