Business Segments (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Business Segments [Table Text Block]

	Three Months Ended
	March 31,
	2017			2016
Millions
Operating Revenue
Regulated Operations	$281.6			$252.3
Energy Infrastructure and Related Services
ALLETE Clean Energy	23.7			23.6
U.S. Water Services	32.1			32.4
Corporate and Other	28.2			25.5
Total Operating Revenue		$365.6			$333.8
Net Income (Loss) Attributable to ALLETE
Regulated Operations		$43.5			$42.4
Energy Infrastructure and Related Services
ALLETE Clean Energy	6.7			6.1
U.S. Water Services	(0.3		)	(0.5		)
Corporate and Other	(0.9		)	(2.1		)
Total Net Income Attributable to ALLETE		$49.0			$45.9

NOTE 14. BUSINESS SEGMENTS (Continued)

	March 31, 2017		December 31, 2016
Millions
Assets
Regulated Operations	$3,828.2		$3,823.9
Energy Infrastructure and Related Services
ALLETE Clean Energy	571.7		566.0
U.S. Water Services	265.1		264.1
Corporate and Other	276.9		222.9
Total Assets		$4,941.9		$4,876.9