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Earnings Per Share and Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block] |
|  |  | 2017 |  |  |  |  |  | 2016 |  |
Reconciliation of Basic and Diluted |  |  | Dilutive |  |  |  |  |  | Dilutive |  |
Earnings Per Share | Basic |  | Securities |  | Diluted |  | Basic |  | Securities |  | Diluted
Millions Except Per Share Amounts |  |  |  |  |  |  |  |  |  |  |
Quarter ended June 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE |  | $36.9 |  |  |  |  |  | $36.9 |  |  |  | $24.8 |  |  |  |  |  | $24.8 |
Average Common Shares | 50.9 |  |  | 0.2 |  |  | 51.1 |  |  | 49.3 |  |  | 0.2 |  |  | 49.5 |
Earnings Per Share |  | $0.73 |  |  |  |  |  | $0.72 |  |  |  | $0.50 |  |  |  |  |  | $0.50 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE |  | $85.9 |  |  |  |  |  | $85.9 |  |  |  | $70.7 |  |  |  |  |  | $70.7 |
Average Common Shares | 50.5 |  |  | 0.2 |  |  | 50.7 |  |  | 49.2 |  |  | 0.1 |  |  | 49.3 |
Earnings Per Share |  | $1.70 |  |  |  |  |  | $1.69 |  |  |  | $1.44 |  |  |  |  |  | $1.43 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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