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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2011
Comprehensive Income (Loss) [Abstract] |
Comprehensive Income (Loss) [Table Text Block] |
Comprehensive Income (Loss) |  |  |
Year Ended December 31 | 2011 | 2010 | 2009
Millions |  |  |
Net Income |  | $93.6 |  |  | $74.8 |  |  | $60.7 |
Other Comprehensive Income |  |  |
Unrealized Gain (Loss) on Securities Net of income taxes of $(0.1), $0.6, and $1.7 | (0.3 | ) | 0.8 |  | 2.8 |
Unrealized Loss on Derivatives Net of income taxes of $(0.2), $-, and $- | (0.3 | ) | — |  | — |
Defined Benefit Pension and Other Postretirement Plans Net of income taxes of $(3.6), $-, and $4.1 | (5.1 | ) | — |  | 6.2 |
Total Other Comprehensive Income (Loss) | (5.7 | ) | 0.8 |  | 9.0 |
Total Comprehensive Income |  | $87.9 |  |  | $75.6 |  |  | $69.7 |
Less: Non-Controlling Interest in Subsidiaries | (0.2 | ) | (0.5 | ) | (0.3 | )
Comprehensive Income Attributable to ALLETE |  | $88.1 |  |  | $76.1 |  |  | $70.0 |
Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
Accumulated Other Comprehensive Income (Loss) |  |
As of December 31 | 2011 | 2010
Millions |  |
Unrealized Loss on Securities | $(1.3) | $(1.0)
Unrealized Loss on Derivatives | (0.3 | ) | — |
Defined Benefit Pension and Other Postretirement Plans | (27.3 | ) | (22.2 | )
Total Accumulated Other Comprehensive Loss | $(28.9) | $(23.2)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of components of comprehensive income (loss) including, but not limited to: (a) foreign currency translation adjustments; (b) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (c) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (d) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (e) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (f) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (g) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 220 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 45 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e526-108580 + Details
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