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Business Segments (Tables)

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Business Segments [Table Text Block]

									Three Months Ended
									March 31
												2023			2022
Millions
Operating Revenue
Regulated Operations
Residential												$49.4			$56.0
Commercial												47.7			48.3
Municipal												8.9			12.1
Industrial												144.9			147.8
Other Power Suppliers												35.9			41.0
Other												25.8			23.8
Total Regulated Operations												312.6			329.0
ALLETE Clean Energy
Long-term PSA												18.4			25.4
Sale of Wind Energy Facility												181.8			—
Other												1.3			2.8
Total ALLETE Clean Energy												201.5			28.2
Corporate and Other
Long-term Contract												25.5			22.6
Sale of Renewable Development Projects												19.8			—
Other												5.5			3.7
Total Corporate and Other												50.8			26.3
Total Operating Revenue												$564.9			$383.5
Net Income (Loss) Attributable to ALLETE
Regulated Operations												$40.6			$51.5
ALLETE Clean Energy												8.5			16.5
Corporate and Other												9.1			(1.7)
Total Net Income Attributable to ALLETE												$58.2			$66.3

			March 31, 2023			December 31, 2022
Millions
Assets
Regulated Operations			$4,268.8			$4,291.4
ALLETE Clean Energy			1,697.3			1,873.3
Corporate and Other			738.4			680.9
Total Assets			$6,704.5			$6,845.6

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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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://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 https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599

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- References

No definition available.

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