Investment in ATC (Tables)

12 Months Ended

Dec. 31, 2014

Investment in ATC [Abstract]

ALLETE's Interest in ATC [Table Text Block]

ALLETE’s Investment in ATC
Year Ended December 31	2014			2013
Millions
Equity Investment Beginning Balance		$114.6			$107.3
Cash Investments	3.9			3.1
Equity in ATC Earnings	19.6			20.3
Distributed ATC Earnings	(17.0		)	(16.1		)
Equity Investment Ending Balance		$121.1			$114.6

ATC Summarized Financial Data [Table Text Block]

ATC Summarized Financial Data
Balance Sheet Data
As of December 31	2014		2013
Millions
Current Assets		$66.4		$80.7
Non-Current Assets	3,728.7		3,509.5
Total Assets		$3,795.1		$3,590.2
Current Liabilities		$313.1		$381.4
Long-Term Debt	1,701.0		1,550.0
Other Non-Current Liabilities	163.8		126.2
Members’ Equity	1,617.2		1,532.6
Total Liabilities and Members’ Equity		$3,795.1		$3,590.2

Income Statement Data
Year Ended December 31	2014		2013		2012
Millions
Revenue		$635.0		$626.3		$603.2
Operating Expense	307.4		295.1		281.0
Other Expense	88.9		83.6		84.8
Net Income		$238.7		$247.6		$237.4
ALLETE’s Equity in Net Income		$19.6		$20.3		$19.4