Business Segments (Tables)

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Three Months Ended
	March 31,
	2022	2021
Millions
Operating Revenue
Regulated Operations
Residential	$56.0	$45.6
Commercial	48.3	39.7
Municipal	12.1	12.6
Industrial	147.8	129.0
Other Power Suppliers	41.0	38.4
Other	23.8	27.7
Total Regulated Operations	329.0	293.0
ALLETE Clean Energy
Long-term PSA	25.4	18.1
Other	2.8	2.8
Total ALLETE Clean Energy	28.2	20.9
Corporate and Other
Long-term Contract	22.6	21.7
Other	3.7	3.6
Total Corporate and Other	26.3	25.3
Total Operating Revenue	$383.5	$339.2
Net Income (Loss) Attributable to ALLETE
Regulated Operations	$51.5	$45.0
ALLETE Clean Energy	16.5	7.4
Corporate and Other	(1.7)	(0.6)
Total Net Income Attributable to ALLETE	$66.3	$51.8

	March 31, 2022	December 31, 2021
Millions
Assets
Regulated Operations	$4,297.1	$4,289.4
ALLETE Clean Energy	1,816.1	1,719.4
Corporate and Other	442.8	426.2
Total Assets	$6,556.0	$6,435.0