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Earnings Per Share and Common Stock | 9 Months Ended
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Sep. 30, 2017
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 nine months ended September 30, 2017, and 2016, no options to purchase shares of ALLETE common stock were excluded from the computation of diluted earnings per share.
|  |  | 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 September 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE |  | $44.9 |  |  |  |  |  | $44.9 |  |  |  | $40.3 |  |  |  |  |  | $40.3 |
Average Common Shares | 51.0 |  |  | 0.2 |  |  | 51.2 |  |  | 49.4 |  |  | 0.1 |  |  | 49.5 |
Earnings Per Share |  | $0.88 |  |  |  |  |  | $0.88 |  |  |  | $0.82 |  |  |  |  |  | $0.81 |
Nine Months Ended September 30, |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE |  | $130.8 |  |  |  |  |  | $130.8 |  |  |  | $111.0 |  |  |  |  |  | $111.0 |
Average Common Shares | 50.7 |  |  | 0.2 |  |  | 50.9 |  |  | 49.3 |  |  | 0.1 |  |  | 49.4 |
Earnings Per Share |  | $2.58 |  |  |  |  |  | $2.57 |  |  |  | $2.25 |  |  |  |  |  | $2.25 |
Contributions to Pension. For the nine months ended September 30, 2017, we contributed 0.2 million shares of ALLETE common stock to our defined benefit pension plans, which had an aggregate value of $13.5 million when contributed (no shares were contributed to the defined benefit pension plans for the nine months ended September 30, 2016). These shares of ALLETE common stock were contributed in reliance upon an exemption available pursuant to Section 4(a)(2) of the Securities Act of 1933, as amended.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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