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Common Stock and Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Summary of Common Stock [Table Text Block] |
Summary of Common Stock | Shares | Equity
| Thousands | Millions
Balance as of December 31, 2019 | 51,679 |  | $1,436.7 |
Employee Stock Purchase Plan | 13 |  | 0.7 |
Invest Direct | 309 |  | 18.3 |
Share-Based Compensation | 84 |  | 5.2 |
Balance as of December 31, 2020 | 52,085 |  | 1,460.9 |
Employee Stock Purchase Plan | 17 |  | 0.8 |
Invest Direct | 263 |  | 17.5 |
Share-Based Compensation | 73 |  | 6.5 |
Equity Issuance Program | 782 |  | 51.0 |
Balance as of December 31, 2021 | 53,220 |  | 1,536.7 |
Employee Stock Purchase Plan | 11 |  | 0.9 |
Invest Direct | 244 |  | 14.9 |
Share-Based Compensation | 82 |  | 5.3 |
Equity Issuance | 3,680 |  | 223.7 |
Balance as of December 31, 2022 | 57,237 |  | $1,781.5 |
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 |  |  |
2022 |  |  |
Net Income Attributable to ALLETE | $189.3 |  |  | $189.3 |
Average Common Shares | 55.9 |  | 0.1 |  | 56.0 |
Earnings Per Share | $3.38 |  |  | $3.38 |
2021 |  |  |
Net Income Attributable to ALLETE | $169.2 |  |  | $169.2 |
Average Common Shares | 52.4 |  | 0.1 |  | 52.5 |
Earnings Per Share | $3.23 |  |  | $3.23 |
2020 |  |  |
Net Income Attributable to ALLETE | $165.4 |  |  | $165.4 |
Average Common Shares | 51.9 |  | — |  | 51.9 |
Earnings Per Share | $3.18 |  |  | $3.18 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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