Earnings Per Share and Common Stock

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share and Common Stock [Text Block]

EARNINGS PER SHARE AND COMMON STOCK

We compute basic earnings per share using the weighted average number of shares of common stock outstanding during each period. The difference between basic and diluted earnings per share, if any, arises from non-vested restricted stock units and performance share awards granted under our Executive Long-Term Incentive Compensation Plan.

			2020					2019
Reconciliation of Basic and Diluted			Dilutive					Dilutive
Earnings Per Share	Basic		Securities	Diluted		Basic		Securities	Diluted
Millions Except Per Share Amounts
Three Months Ended March 31,
Net Income Attributable to ALLETE		$66.3			$66.3		$70.5			$70.5
Average Common Shares	51.7		0.1	51.8		51.6		0.1	51.7
Earnings Per Share		$1.28			$1.28		$1.37			$1.37