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Business Segments (Tables) | 9 Months Ended
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Sep. 30, 2021
Segment Reporting [Abstract] |
Business Segments [Table Text Block] |
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2021 | 2020 |  | 2021 | 2020
Millions |  |  |  |  |
Operating Revenue |  |  |  |  |
Regulated Operations |  |  |  |  |
Residential | $37.0 |  | $34.2 |  |  | $118.0 |  | $102.5 |
Commercial | 44.3 |  | 37.1 |  |  | 124.7 |  | 103.2 |
Municipal | 14.4 |  | 11.2 |  |  | 38.5 |  | 30.5 |
Industrial | 139.7 |  | 109.6 |  |  | 407.8 |  | 316.4 |
Other Power Suppliers | 41.2 |  | 30.9 |  |  | 116.9 |  | 96.6 |
CIP Financial Incentive (a) | 2.4 |  | 2.4 |  |  | 2.4 |  | 2.4 |
Other | 25.8 |  | 29.7 |  |  | 79.9 |  | 69.6 |
Total Regulated Operations | 304.8 |  | 255.1 |  |  | 888.2 |  | 721.2 |
ALLETE Clean Energy |  |  |  |  |
Long-term PSA | 14.0 |  | 11.9 |  |  | 50.8 |  | 44.0 |
Other | 2.9 |  | 2.9 |  |  | 8.6 |  | 8.5 |
Total ALLETE Clean Energy | 16.9 |  | 14.8 |  |  | 59.4 |  | 52.5 |
Corporate and Other |  |  |  |  |
Long-term Contract | 20.3 |  | 20.7 |  |  | 63.4 |  | 65.6 |
Other | 3.4 |  | 3.3 |  |  | 9.2 |  | 9.4 |
Total Corporate and Other | 23.7 |  | 24.0 |  |  | 72.6 |  | 75.0 |
Total Operating Revenue | $345.4 |  | $293.9 |  |  | $1,020.2 |  | $848.7 |
Net Income (Loss) Attributable to ALLETE |  |  |  |  |
Regulated Operations | $32.9 |  | $42.4 |  |  | $99.4 |  | $111.0 |
ALLETE Clean Energy | (0.8) |  | 1.1 |  |  | 11.7 |  | 16.8 |
Corporate and Other | (4.5) |  | (2.8) |  |  | (3.8) |  | (0.7) |
Total Net Income Attributable to ALLETE | $27.6 |  | $40.7 |  |  | $107.3 |  | $127.1 |
(a)See Note 2. Regulatory Matters.
| September 30, 2021 | December 31, 2020
Millions |  |
Assets |  |
Regulated Operations | $4,207.4 |  | $4,196.8 |
ALLETE Clean Energy | 1,691.4 |  | 1,483.3 |
Corporate and Other | 433.4 |  | 404.5 |
Total Assets | $6,332.2 |  | $6,084.6 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 + Details
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