Equity Investments (Tables)

9 Months Ended

Sep. 30, 2019

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, 2018		$128.1
Cash Investments	4.7
Equity in ATC Earnings	15.3
Distributed ATC Earnings	(12.1		)
Amortization of the Remeasurement of Deferred Income Taxes	0.9
Equity Investment Balance as of September 30, 2019		$136.9