Business Segments (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Quarter Ended		Six Months Ended
	June 30,		June 30,
	2020	2019	2020	2019
Millions
Operating Revenue
Regulated Operations
Residential	$27.4	$29.2	$68.3	$74.4
Commercial	28.8	34.9	66.1	73.8
Municipal	9.0	12.2	19.3	27.6
Industrial	88.0	120.3	206.8	241.9
Other Power Suppliers	27.4	35.2	65.7	74.6
Other	20.2	18.0	39.9	39.7
Total Regulated Operations	200.8	249.8	466.1	532.0
ALLETE Clean Energy
Long-term PSA	14.8	12.5	32.1	27.1
Other	2.8	2.9	5.6	5.8
Total ALLETE Clean Energy	17.6	15.4	37.7	32.9
U.S. Water Services (a)
Point-in-Time	—	—	—	19.0
Contract	—	—	—	9.2
Capital Project	—	—	—	5.2
Total U.S. Water Services	—	—	—	33.4
Corporate and Other
Long-term Contract	22.5	21.2	44.9	41.4
Other	2.3	4.0	6.1	7.9
Total Corporate and Other	24.8	25.2	51.0	49.3
Total Operating Revenue	$243.2	$290.4	$554.8	$647.6
Net Income (Loss) Attributable to ALLETE
Regulated Operations	$11.1	$30.3	$68.6	$81.8
ALLETE Clean Energy	4.0	1.9	15.7	7.7
U.S. Water Services (a)	—	—	—	(1.1)
Corporate and Other (a)	5.0	2.0	2.1	16.3
Total Net Income Attributable to ALLETE	$20.1	$34.2	$86.4	$104.7

(a)  In March 2019, ALLETE sold U.S. Water Services. The Company recognized a gain on the sale of $11.1 million after-tax during the six months ended June 30, 2019, which is reflected in Corporate and Other.

	June 30, 2020	December 31, 2019
Millions
Assets
Regulated Operations	$4,139.8	$4,130.8
ALLETE Clean Energy	1,250.2	1,001.5
Corporate and Other	370.4	350.5
Total Assets	$5,760.4	$5,482.8