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Earnings Per Share and Common Stock | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share and Common Stock [Text Block] | EARNINGS PER SHARE AND COMMON STOCK We compute basic earnings per share using the weighted average number of shares of common stock outstanding during each period. The difference between basic and diluted earnings per share, if any, arises from outstanding stock options, non-vested restricted stock units and performance share awards granted under our Executive Long-Term Incentive Compensation Plan. For the quarter and six months ended June 30, 2018, and 2017, no options to purchase shares of ALLETE common stock were excluded from the computation of diluted earnings per share.
|  |  | 2018 |  |  |  |  |  | 2017 |  |
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 |  | $31.3 |  |  |  |  |  | $31.3 |  |  |  | $36.9 |  |  |  |  |  | $36.9 |
Average Common Shares | 51.3 |  |  | 0.2 |  |  | 51.5 |  |  | 50.9 |  |  | 0.2 |  |  | 51.1 |
Earnings Per Share |  | $0.61 |  |  |  |  |  | $0.61 |  |  |  | $0.73 |  |  |  |  |  | $0.72 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $82.3 |  |  |  |  |  | $82.3 |  |  |  | $85.9 |  |  |  |  |  | $85.9 |
Average Common Shares | 51.2 |  |  | 0.2 |  |  | 51.4 |  |  | 50.5 |  |  | 0.2 |  |  | 50.7 |
Earnings Per Share |  | $1.61 |  |  |  |  |  | $1.60 |  |  |  | $1.70 |  |  |  |  |  | $1.69 |

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- References No definition available. + Details
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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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