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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Data (Unaudited) [Abstract] |
Quarterly Financial Data (Unaudited) [Text Block] | QUARTERLY FINANCIAL DATA (UNAUDITED) Information for any one quarterly period is not necessarily indicative of the results which may be expected for the year.
Quarter Ended | Mar. 31 |  | Jun. 30 |  | Sept. 30 |  | Dec. 31 |
Millions Except Earnings Per Share |  |  |  |
2014 |  |  |  |
Operating Revenue |  | $296.5 |  |  | $260.7 |  |  | $288.9 |  |  | $290.7 |
Operating Income |  | $48.3 |  |  | $28.2 |  |  | $60.8 |  |  | $51.5 |
Net Income Attributable to ALLETE |  | $33.5 |  |  | $16.8 |  |  | $41.6 |  |  | $32.9 |
Earnings Per Share of Common Stock |  |  |  |
Basic |  | $0.81 |  |  | $0.40 |  |  | $0.97 |  |  | $0.73 |
Diluted |  | $0.80 |  |  | $0.40 |  |  | $0.97 |  |  | $0.73 |
2013 |  |  |  |
Operating Revenue |  | $263.8 |  |  | $235.6 |  |  | $251.0 |  |  | $268.0 |
Operating Income |  | $44.4 |  |  | $24.4 |  |  | $38.4 |  |  | $46.9 |
Net Income Attributable to ALLETE |  | $32.5 |  |  | $14.0 |  |  | $25.2 |  |  | $33.0 |
Earnings Per Share of Common Stock |  |  |  |
Basic |  | $0.83 |  |  | $0.36 |  |  | $0.63 |  |  | $0.82 |
Diluted |  | $0.83 |  |  | $0.35 |  |  | $0.63 |  |  | $0.82 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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