Investment in ATC (Tables)

3 Months Ended

Mar. 31, 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	1.6
Equity in ATC Earnings	4.7
Distributed ATC Earnings	(5.2		)
Amortization of the Remeasurement of Deferred Income Taxes (a)	0.3
Equity Investment Balance as of March 31, 2018		$120.1

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