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Investment in ATC (Tables)

12 Months Ended

Dec. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

ALLETE's Investment in ATC [Table Text Block]



ALLETE’s Investment in ATC
Year Ended December 31	2017			2016
Millions
Equity Investment Beginning Balance		$135.6			$124.5
Cash Investments	7.8			5.4
Equity in ATC Earnings	22.5			18.5
Distributed ATC Earnings	(19.3		)	(12.8		)
Remeasurement of Deferred Income Taxes (a)	(27.9		)	—
Equity Investment Ending Balance		$118.7			$135.6


(a)	Impact of the remeasurement of deferred income tax assets and liabilities resulting from the TCJA. (See Note 1. Operations and Significant Accounting Policies.)



ATC Summarized Financial Data
Balance Sheet Data
As of December 31	2017			2016
Millions
Current Assets		$87.7			$75.8
Non-Current Assets	4,598.9			4,312.9
Total Assets		$4,686.6			$4,388.7
Current Liabilities		$767.2			$495.1
Long-Term Debt	1,790.6			1,865.3
Other Non-Current Liabilities	240.3			271.5
Members’ Equity	1,888.5			1,756.8
Total Liabilities and Members’ Equity		$4,686.6			$4,388.7



Income Statement Data
Year Ended December 31	2017			2016			2015
Millions
Revenue		$721.6			$650.8			$615.8
Operating Expense	344.9			322.5			319.3
Other Expense	104.1			95.5			96.1
Net Income		$272.6			$232.8			$200.4
ALLETE’s Equity in Net Income		$22.5			$18.5			$16.3