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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Selected Quarterly Financial Information [Abstract]

Quarterly Financial Data (Unaudited) [Table Text Block]


Quarter Ended			Mar. 31			Jun. 30			Sept. 30			Dec. 31
Millions Except Earnings Per Share
2021
Operating Revenue			$339.2			$335.6			$345.4			$399.0
Operating Income			$42.0			$28.2			$31.1			$50.0
Net Income Attributable to ALLETE			$51.8			$27.9			$27.6			$61.9
Earnings Per Share of Common Stock
Basic			$0.99			$0.53			$0.53			$1.18
Diluted			$0.99			$0.53			$0.53			$1.18
2020
Operating Revenue			$311.6			$243.2			$293.9			$320.4
Operating Income			$60.2			$12.7			$41.6			$36.4
Net Income Attributable to ALLETE			$66.3			$20.1			$40.7			$47.1
Earnings Per Share of Common Stock
Basic			$1.28			$0.39			$0.78			$0.91
Diluted			$1.28			$0.39			$0.78			$0.90
2019
Operating Revenue			$357.2			$290.4			$288.3			$304.6
Operating Income			$56.8			$36.2			$37.0			$49.8
Net Income Attributable to ALLETE			$70.5			$34.2			$31.2			$49.7
Earnings Per Share of Common Stock
Basic			$1.37			$0.66			$0.60			$0.96
Diluted			$1.37			$0.66			$0.60			$0.96