Business Segments (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Three Months Ended
	March 31,
	2020			2019
Millions
Operating Revenue
Regulated Operations
Residential		$40.9			$45.2
Commercial	37.3			38.9
Municipal	10.3			15.4
Industrial	118.8			121.6
Other Power Suppliers	38.3			39.4
Other	19.7			21.7
Total Regulated Operations	265.3			282.2
ALLETE Clean Energy
Long-term PSA	17.3			14.6
Other	2.8			2.9
Total ALLETE Clean Energy	20.1			17.5
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	22.4			20.2
Other	3.8			3.9
Total Corporate and Other	26.2			24.1
Total Operating Revenue		$311.6			$357.2
Net Income (Loss) Attributable to ALLETE
Regulated Operations		$57.5			$51.5
ALLETE Clean Energy	11.7			5.8
U.S. Water Services (a)	—			(1.1		)
Corporate and Other (a)	(2.9		)	14.3
Total Net Income Attributable to ALLETE		$66.3			$70.5

(a) In March 2019, ALLETE sold U.S. Water Services. The Company recognized a gain on the sale of $9.9 million after-tax during the three months ended March 31, 2019, which is reflected in Corporate and Other.

	March 31, 2020		December 31, 2019
Millions
Assets
Regulated Operations		$4,145.5		$4,130.8
ALLETE Clean Energy	1,099.6		1,001.5
Corporate and Other	374.4		350.5
Total Assets		$5,619.5		$5,482.8