Equity Investments (Tables)

3 Months Ended

Mar. 31, 2020

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, 2019		$141.6
Cash Investments	0.4
Equity in ATC Earnings	5.2
Distributed ATC Earnings	(5.2		)
Amortization of the Remeasurement of Deferred Income Taxes	0.3
Equity Investment Balance as of March 31, 2020		$142.3