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Earnings Per Share and Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share - Basic [Abstract]
Net Income Attributable ALLETE	$ 27.9	$ 20.1	$ 79.7	$ 86.4
Average Common Shares	52.2	51.8	52.2	51.8
Earnings Per Share	$ 0.53	$ 0.39	$ 1.53	$ 1.67
Earnings Per Share - Diluted [Abstract]
Net Income Attributable to ALLETE	$ 27.9	$ 20.1	$ 79.7	$ 86.4
Average Common Shares	52.3	51.9	52.2	51.8
Earnings Per Share	$ 0.53	$ 0.39	$ 1.53	$ 1.67
Dilutive Securities (Shares)	0.1	0.1	0.0	0.0

X

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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