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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Selected Quarterly Financial Information [Abstract] |
Quarterly Financial Data (Unaudited) [Table Text Block] |
Quarter Ended | Mar. 31 |  | Jun. 30 |  | Sept. 30 |  | Dec. 31 |
Millions Except Earnings Per Share |  |  |  |
2018 |  |  |  |
Operating Revenue |  | $358.2 |  |  | $344.1 |  |  | $348.0 |  |  | $448.3 |
Operating Income |  | $57.4 |  |  | $36.5 |  |  | $43.3 |  |  | $64.0 |
Net Income Attributable to ALLETE |  | $51.0 |  |  | $31.3 |  |  | $30.7 |  |  | $61.1 |
Earnings Per Share of Common Stock |  |  |  |
Basic |  | $1.00 |  |  | $0.61 |  |  | $0.59 |  |  | $1.19 |
Diluted |  | $0.99 |  |  | $0.61 |  |  | $0.59 |  |  | $1.18 |
2017 |  |  |  |
Operating Revenue |  | $365.6 |  |  | $353.3 |  |  | $362.5 |  |  | $337.9 |
Operating Income |  | $71.6 |  |  | $54.0 |  |  | $68.0 |  |  | $32.3 |
Net Income Attributable to ALLETE |  | $49.0 |  |  | $36.9 |  |  | $44.9 |  |  | $41.4 |
Earnings Per Share of Common Stock |  |  |  |
Basic |  | $0.97 |  |  | $0.73 |  |  | $0.88 |  |  | $0.81 |
Diluted |  | $0.97 |  |  | $0.72 |  |  | $0.88 |  |  | $0.81 |
2016 |  |  |  |
Operating Revenue |  | $333.8 |  |  | $314.8 |  |  | $349.6 |  |  | $341.5 |
Operating Income |  | $65.2 |  |  | $40.6 |  |  | $51.8 |  |  | $59.4 |
Net Income Attributable to ALLETE |  | $45.9 |  |  | $24.8 |  |  | $40.3 |  |  | $44.3 |
Earnings Per Share of Common Stock |  |  |  |
Basic |  | $0.93 |  |  | $0.50 |  |  | $0.82 |  |  | $0.89 |
Diluted |  | $0.93 |  |  | $0.50 |  |  | $0.81 |  |  | $0.89 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration