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Earnings Per Share and Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2023
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block] |
|  |  | 2023 |  |  |  |  |  | 2022 |  |
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 Attributable to ALLETE | $51.5 |  |  |  |  | $51.5 |  |  | $37.6 |  |  |  |  | $37.6 |
Average Common Shares | 57.3 |  |  | 0.1 |  |  | 57.4 |  |  | 56.1 |  |  | — |  |  | 56.1 |
Earnings Per Share | $0.90 |  |  |  |  | $0.90 |  |  | $0.67 |  |  |  |  | $0.67 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |
Net Income Attributable to ALLETE | $109.7 |  |  |  |  | $109.7 |  |  | $103.9 |  |  |  |  | $103.9 |
Average Common Shares | 57.3 |  |  | 0.1 |  |  | 57.4 |  |  | 54.9 |  |  | — |  |  | 54.9 |
Earnings Per Share | $1.91 |  |  |  |  | $1.91 |  |  | $1.89 |  |  |  |  | $1.89 |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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