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Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2011
Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Comprehensive Income (Loss) [Table Text Block] |
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
Comprehensive Income (Loss) | 2011 |  | 2010 |  | 2011 |  | 2010
Millions |  |  |  |  |  |  |
Net Income | $20.5 |  | $19.5 |  | $74.5 |  | $61.7
Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Unrealized Gain (Loss) on Securities |  |  |  |  |  |  |
Net of income taxes of $(1.1), $0.3, $(0.3) and $(0.1) | (1.4) |  | 0.4 |  | (0.3) |  | (0.1)
Unrealized Loss on Derivatives |  |  |  |  |  |  |
Net of income taxes of $(0.2), $—, $(0.2) and $— | (0.3) |  | — |  |  | (0.3) |  | — |
Defined Benefit Pension and Other Postretirement Plans |  |  |  |  |  |  |
Net of income taxes of $0.3, $0.2, $0.8 and $0.7 | 0.3 |  | 0.3 |  | 1.1 |  | 0.9
Total Other Comprehensive Income (Loss) | (1.4) |  | 0.7 |  | 0.5 |  | 0.8
Total Comprehensive Income | $19.1 |  | $20.2 |  | $75.0 |  | $62.5
Less: Non-Controlling Interest in Subsidiaries | — |  |  | (0.1) |  | (0.2) |  | (0.3)
Comprehensive Income Attributable to ALLETE | $19.1 |  | $20.3 |  | $75.2 |  | $62.8

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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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