Business Segments (Tables)

3 Months Ended

Mar. 31, 2015

Business Segments [Abstract]

Business Segments [Table Text Block]

	Consolidated			Regulated Operations			Investments and Other
Millions
Three Months Ended March 31, 2015
Operating Revenue		$320.0			$262.8			$57.2
Fuel and Purchased Power	86.0			86.0			—
Transmission Services	14.9			14.9			—
Cost of Sales	31.2			4.5			26.7
Operating and Maintenance	79.7			58.7			21.0
Depreciation and Amortization	39.0			32.1			6.9
Taxes Other than Income Taxes	12.8			11.6			1.2
Operating Income	56.4			55.0			1.4
Interest Expense	(15.1		)	(13.0		)	(2.1		)
Equity Earnings in ATC	3.9			3.9			—
Other Income	1.1			0.9			0.2
Income (Loss) Before Non-Controlling Interest and Income Taxes	46.3			46.8			(0.5		)
Income Tax Expense	6.2			5.4			0.8
Net Income (Loss)	40.1			41.4			(1.3		)
Less: Non-Controlling Interest in Subsidiaries	0.2			—			0.2
Net Income (Loss) Attributable to ALLETE		$39.9			$41.4		$(1.5)
As of March 31, 2015
Total Assets		$4,580.1			$3,748.4			$831.7
Property, Plant and Equipment – Net		$3,319.2			$3,025.3			$293.9
Accumulated Depreciation		$1,367.0			$1,286.9			$80.1
Capital Additions		$57.3			$54.9			$2.4

NOTE 2.  BUSINESS SEGMENTS (Continued)

	Consolidated			Regulated Operations			Investments and Other
Millions
Three Months Ended March 31, 2014
Operating Revenue		$296.5			$264.2			$32.3
Fuel and Purchased Power	96.2			96.2			—
Transmission Services	10.8			10.8			—
Cost of Sales	23.5			8.7			14.8
Operating and Maintenance	74.3			60.5			13.8
Depreciation and Amortization	32.2			28.8			3.4
Taxes Other than Income Taxes	11.2			10.2			1.0
Operating Income (Loss)	48.3			49.0			(0.7		)
Interest Expense	(12.8		)	(11.5		)	(1.3		)
Equity Earnings in ATC	5.1			5.1			—
Other Income	2.0			1.8			0.2
Income (Loss) Before Non-Controlling Interest and Income Taxes	42.6			44.4			(1.8		)
Income Tax Expense (Benefit)	8.8			10.5			(1.7		)
Net Income (Loss)	33.8			33.9			(0.1		)
Less: Non-Controlling Interest in Subsidiaries	0.3			—			0.3
Net Income (Loss) Attributable to ALLETE		$33.5			$33.9		$(0.4)
As of March 31, 2014
Total Assets		$3,749.2			$3,335.5			$413.7
Property, Plant and Equipment – Net		$2,905.1			$2,671.3			$233.8
Accumulated Depreciation		$1,266.7			$1,202.9			$63.8
Capital Additions		$195.2			$193.5			$1.7