Investment in ATC (Tables)

9 Months Ended

Sep. 30, 2018

Equity Method Investments and Joint Ventures [Abstract]

ALLETE's Investment in ATC [Table Text Block]

ALLETE’s Investment in ATC
Millions
Equity Investment Balance as of December 31, 2017		$118.7
Cash Investments	5.0
Equity in ATC Earnings	13.0
Distributed ATC Earnings	(11.7		)
Amortization of the Remeasurement of Deferred Income Taxes (a)	1.0
Equity Investment Balance as of September 30, 2018		$126.0

(a) Amortization related to the impact of the remeasurement of deferred income tax assets and liabilities resulting from the TCJA.