Business Segments (Tables)

12 Months Ended

Dec. 31, 2014

Business Segments [Abstract]

Business Segments [Table Text Block]

	Consolidated			Regulated Operations			Investments and Other
Millions
Year Ended December 31, 2014
Operating Revenue		$1,136.8			$1,003.5			$133.3
Fuel and Purchased Power Expense	356.1			356.1			—
Operating and Maintenance Expense	456.2			345.6			110.6
Depreciation Expense	135.7			118.0			17.7
Operating Income	188.8			183.8			5.0
Interest Expense	(54.8		)	(46.9		)	(7.9		)
Equity Earnings in ATC	19.6			19.6			—
Other Income	8.6			7.8			0.8
Income (Loss) Before Non-Controlling Interest and Income Taxes	162.2			164.3			(2.1		)
Income Tax Expense (Benefit)	36.7			39.9			(3.2		)
Net Income	125.5			124.4			1.1
Less: Non-Controlling Interest in Subsidiaries	0.7			—			0.7
Net Income Attributable to ALLETE		$124.8			$124.4			$0.4
As of December 31, 2014
Total Assets		$4,360.8			$3,709.6			$651.2
Capital Additions		$604.3			$583.5			$20.8

NOTE 2. BUSINESS SEGMENTS (Continued)

	Consolidated			Regulated Operations			Investments and Other
Millions
Year Ended December 31, 2013
Operating Revenue		$1,018.4			$925.5			$92.9
Fuel and Purchased Power Expense	334.8			334.8			—
Operating and Maintenance Expense	412.9			322.4			90.5
Depreciation Expense	116.6			110.2			6.4
Operating Income (Loss)	154.1			158.1			(4.0		)
Interest Expense	(50.3		)	(42.1		)	(8.2		)
Equity Earnings in ATC	20.3			20.3			—
Other Income	9.3			4.7			4.6
Income (Loss) Before Non-Controlling Interest and Income Taxes	133.4			141.0			(7.6		)
Income Tax Expense (Benefit)	28.7			36.1			(7.4		)
Net Income (Loss)	104.7			104.9			(0.2		)
Less: Non-Controlling Interest in Subsidiaries	—			—			—
Net Income (Loss) Attributable to ALLETE		$104.7			$104.9		$(0.2)
As of December 31, 2013
Total Assets		$3,476.8			$3,160.8			$316.0
Capital Additions		$339.5			$326.3			$13.2

	Consolidated			Regulated Operations			Investments and Other
Millions
Year Ended December 31, 2012
Operating Revenue		$961.2			$874.4			$86.8
Fuel and Purchased Power Expense	308.7			308.7			—
Operating and Maintenance Expense	397.1			310.0			87.1
Depreciation Expense	100.2			93.9			6.3
Operating Income (Loss)	155.2			161.8			(6.6		)
Interest Expense	(45.5		)	(39.8		)	(5.7		)
Equity Earnings in ATC	19.4			19.4			—
Other Income	6.0			5.1			0.9
Income (Loss) Before Non-Controlling Interest and Income Taxes	135.1			146.5			(11.4		)
Income Tax Expense (Benefit)	38.0			50.4			(12.4		)
Net Income	97.1			96.1			1.0
Less: Non-Controlling Interest in Subsidiaries	—			—			—
Net Income Attributable to ALLETE		$97.1			$96.1		$1.0
As of December 31, 2012
Total Assets		$3,253.4			$2,962.4			$291.0
Capital Additions		$432.2			$418.2			$14.0