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Common Stock and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Common Stock [Table Text Block] |
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 |
Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block] |
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 Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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