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Earnings Per Share and Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to ALLETE	$ 58.2	$ 66.3
Net Income Attributable to ALLETE	$ 58.2	$ 66.3
Basic (Shares)	57.3	53.3
Dilutive Securities (Shares)	0.0	0.0
Diluted (Shares)	57.3	53.3
Basic Earnings Per Share of Common Stock	$ 1.02	$ 1.24
Diluted Earnings Per Share of Common Stock	$ 1.02	$ 1.24

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