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Common Stock and Earnings Per Share | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Common Stock and Earnings Per Share [Text Block] | COMMON STOCK AND EARNINGS PER SHARE
Summary of Common Stock | Shares |  | Equity |
| Thousands |  | Millions |
Balance as of December 31, 2015 | 49,075 |  |  | $1,271.4 |
Employee Stock Purchase Plan | 16 |  | 0.9 |
Invest Direct | 344 |  | 20.0 |
Options and Stock Awards | 65 |  | 3.7 |
Contributions to RSOP | 60 |  | 3.3 |
Equity Issuance Program | 130 |  | 8.0 |
Received for Sale of Land Inventory | (130 | ) | (8.0 | )
Acquisition of Non-Controlling Interest | — |  | (4.0 | )
Balance as of December 31, 2016 | 49,560 |  | 1,295.3 |
Employee Stock Purchase Plan | 12 |  | 0.8 |
Invest Direct | 257 |  | 19.0 |
Options and Stock Awards | 22 |  | 3.6 |
Contributions to RSOP | 50 |  | 3.5 |
Equity Issuance Program | 1,000 |  | 65.7 |
Contribution to Pension | 216 |  | 13.5 |
Balance as of December 31, 2017 | 51,117 |  | 1,401.4 |
Employee Stock Purchase Plan | 11 |  | 0.8 |
Invest Direct | 277 |  | 20.7 |
Options and Stock Awards | 57 |  | 2.1 |
Contributions to RSOP | 47 |  | 3.5 |
Balance as of December 31, 2018 | 51,509 |  |  | $1,428.5 |
Equity Issuance Program. We entered into a distribution agreement with Lampert Capital Markets, Inc., in 2008, as amended most recently in 2016, with respect to the issuance and sale of up to an aggregate of 13.6 million shares of our common stock, without par value, of which 2.9 million shares remain available for issuance as of December 31, 2018. For the year ended December 31, 2018, no shares of common stock were issued under this agreement (1.0 million shares for net proceeds of $65.7 million in 2017; 0.1 million shares for net proceeds of $8.0 million in 2016). The shares issued in 2017 and 2016 were offered and sold pursuant to Registration Statement No. 333-212794, pursuant to which the remaining shares will continue to be offered for sale, from time to time. Contributions to Pension. For the year ended December 31, 2018, we contributed no shares of ALLETE common stock to our pension plan (0.2 million shares, which had an aggregate value of $13.5 million in 2017 and none in 2016). The shares of ALLETE common stock contributed in 2017 were contributed in reliance upon an exemption available pursuant to Section 4(a)(2) of the Securities Act of 1933, as amended. Earnings Per Share. 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. No options to purchase shares of common stock were excluded from the computation of diluted earnings per share in 2018, 2017 and 2016. NOTE 12. COMMON STOCK AND EARNINGS PER SHARE (Continued)
Reconciliation of Basic and Diluted |  |  |
Earnings Per Share |  |  | Dilutive |  |  |
Year Ended December 31 | Basic |  | Securities |  | Diluted |
Millions Except Per Share Amounts |  |  |
2018 |  |  |
Net Income Attributable to ALLETE |  | $174.1 |  |  |  | $174.1 |
Average Common Shares | 51.3 |  | 0.2 |  | 51.5 |
Earnings Per Share |  | $3.39 |  |  |  | $3.38 |
Dividends Per Share |  | $2.24 |  |  |  | $2.24 |
2017 |  |  |
Net Income Attributable to ALLETE |  | $172.2 |  |  |  | $172.2 |
Average Common Shares | 50.8 |  | 0.2 |  | 51.0 |
Earnings Per Share |  | $3.39 |  |  |  | $3.38 |
Dividends Per Share |  | $2.14 |  |  |  | $2.14 |
2016 |  |  |
Net Income Attributable to ALLETE |  | $155.3 |  |  |  | $155.3 |
Average Common Shares | 49.3 |  | 0.2 |  | 49.5 |
Earnings Per Share |  | $3.15 |  |  |  | $3.14 |
Dividends Per Share |  | $2.08 |  |  |  | $2.08 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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