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Business Segments (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Quarter Ended							Nine Months Ended
	September 30,							September 30,
	2016			2015				2016			2015
Millions
Operating Revenue
Regulated Operations	$253.3			$250.2				$740.5			$743.0
Energy Infrastructure and Related Services
ALLETE Clean Energy	14.7			151.1				57.1			197.5
U.S. Water Services	37.8			36.1				104.5			86.0
Corporate and Other	43.8			25.1				96.1			79.3
Total Operating Revenue		$349.6			$462.5				$998.2			$1,105.8
Net Income (Loss) Attributable to ALLETE
Regulated Operations		$45.0			$43.8				$110.0			$108.1
Energy Infrastructure and Related Services
ALLETE Clean Energy	1.0			13.2				9.7			18.7
U.S. Water Services	1.5			1.0				2.0			1.5
Corporate and Other	(7.2		)	2.4				(10.7		)	(5.5		)
Total Net Income Attributable to ALLETE		$40.3			$60.4				$111.0			$122.8

NOTE 14. BUSINESS SEGMENTS (Continued)

	September 30, 2016			December 31, 2015
Millions
Assets
Regulated Operations (a)	$3,838.8			$3,853.1
Energy Infrastructure and Related Services
ALLETE Clean Energy (a)	483.5			501.5
U.S. Water Services	259.4			258.3
Corporate and Other	293.1			281.6
Total Assets (a)		$4,874.8			$4,894.5

(a) As a result of revised accounting guidance adopted in the first quarter of 2016, we reclassified unamortized debt issuance costs from Other Non-Current Assets to Long-Term Debt on the Consolidated Balance Sheet. Prior period segment assets have been revised to conform to the current presentation. (See Note 1. Operations and Significant Accounting Policies.)

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599

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- References

No definition available.

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