Business Segments (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Three Months Ended
	March 31,
	2018			2017
Millions
Operating Revenue (a)
Regulated Operations
Residential		$40.7			$39.5
Commercial	36.6			38.2
Municipal	14.0			18.2
Industrial	114.9			121.7
Other Power Suppliers	43.7			41.2
Other	20.3			22.8
Total Regulated Operations	270.2			281.6
Energy Infrastructure and Related Services
ALLETE Clean Energy
Long-term PSA	18.6			17.8
Other	6.0			5.9
Total ALLETE Clean Energy	24.6			23.7
U.S. Water Services
Point-in-Time	22.3			21.8
Contract	9.5			8.9
Capital Project	6.4			1.4
Total U.S. Water Services	38.2			32.1
Corporate and Other
Long-term Contract	20.0			22.1
Other	5.2			6.1
Total Corporate and Other	25.2			28.2
Total Operating Revenue		$358.2			$365.6
Net Income (Loss)
Regulated Operations		$43.9			$43.5
Energy Infrastructure and Related Services
ALLETE Clean Energy	8.1			6.7
U.S. Water Services	(1.4		)	(0.3		)
Corporate and Other	0.4			(0.9		)
Total Net Income		$51.0			$49.0

(a) With the adoption of new revenue recognition guidance, the Company has enhanced the presentation of business segment Operating Revenue. (See Note 1. Operations and Significant Accounting Policies.)

	March 31, 2018		December 31, 2017
Millions
Assets
Regulated Operations		$3,877.0		$3,886.6
Energy Infrastructure and Related Services
ALLETE Clean Energy	620.4		600.5
U.S. Water Services	287.4		292.4
Corporate and Other	287.3		300.5
Total Assets		$5,072.1		$5,080.0