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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2022
Selected Quarterly Financial Information [Abstract] |
Quarterly Financial Data (Unaudited) [Text Block] | QUARTERLY FINANCIAL DATA (UNAUDITED) Information for any one quarterly period is not necessarily indicative of the results which may be expected for the year.
Quarter Ended | Mar. 31 | Jun. 30 | Sept. 30 | Dec. 31
Millions Except Earnings Per Share |  |  |  |
2022 |  |  |  |
Operating Revenue | $383.5 |  | $373.1 |  | $388.3 |  | $425.8 |
Operating Income | $53.4 |  | $13.7 |  | $33.4 |  | $33.7 |
Net Income Attributable to ALLETE | $66.3 |  | $37.6 |  | $33.7 |  | $51.7 |
Earnings Per Share of Common Stock |  |  |  |
Basic | $1.24 |  | $0.67 |  | $0.59 |  | $0.90 |
Diluted | $1.24 |  | $0.67 |  | $0.59 |  | $0.90 |
2021 |  |  |  |
Operating Revenue | $339.2 |  | $335.6 |  | $345.4 |  | $399.0 |
Operating Income | $42.0 |  | $28.2 |  | $31.1 |  | $50.0 |
Net Income Attributable to ALLETE | $51.8 |  | $27.9 |  | $27.6 |  | $61.9 |
Earnings Per Share of Common Stock |  |  |  |
Basic | $0.99 |  | $0.53 |  | $0.53 |  | $1.18 |
Diluted | $0.99 |  | $0.53 |  | $0.53 |  | $1.18 |
2020 (a) |  |  |  |
Operating Revenue | $311.6 |  | $243.2 |  | $293.9 |  | $320.4 |
Operating Income | $60.2 |  | $12.7 |  | $41.6 |  | $23.7 |
Net Income Attributable to ALLETE | $66.3 |  | $20.1 |  | $40.7 |  | $38.3 |
Earnings Per Share of Common Stock |  |  |  |
Basic | $1.28 |  | $0.39 |  | $0.78 |  | $0.74 |
Diluted | $1.28 |  | $0.39 |  | $0.78 |  | $0.73 |
(a) See Immaterial Revision to Prior Period in Note 1. Operations and Significant Accounting Policies.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI https://asc.fasb.org/topic&trid=2126967 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=126900988&loc=SL124452896-108306 + Details
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- References No definition available. + Details
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