EARNINGS PER SHARE AND COMMON STOCK (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Schedule of Reconciliation of Basic and Diluted Earnings Per Share

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.

		2024			2023
Reconciliation of Basic and Diluted		Dilutive			Dilutive
Earnings Per Share	Basic	Securities	Diluted	Basic	Securities	Diluted
Millions Except Per Share Amounts
Quarter ended June 30,
Net Income Attributable to ALLETE	$33.0		$33.0	$51.5		$51.5
Average Common Shares	57.7	0.1	57.8	57.3	0.1	57.4
Earnings Per Share	$0.57		$0.57	$0.90		$0.90
Six Months Ended June 30,
Net Income Attributable to ALLETE	$83.7		$83.7	$109.7		$109.7
Average Common Shares	57.7	—	57.7	57.3	0.1	57.4
Earnings Per Share	$1.45		$1.45	$1.91		$1.91