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Common Stock and Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Summary of Common Stock

Summary of Common Stock			Shares			Equity
			Thousands			Millions
Balance as of December 31, 2020			52,085			$1,460.9
Employee Stock Purchase Plan			17			0.8
Invest Direct			263			17.5
Share-Based Compensation			73			6.5
Equity Issuance Program			782			51.0
Balance as of December 31, 2021			53,220			1,536.7
Employee Stock Purchase Plan			11			0.9
Invest Direct			244			14.9
Share-Based Compensation			82			5.3
Equity Issuance			3,680			223.7
Balance as of December 31, 2022			57,237			1,781.5
Employee Stock Purchase Plan			16			0.8
Invest Direct			232			13.3
Share-Based Compensation			76			8.1
Balance as of December 31, 2023			57,561			$1,803.7

Reconciliation of Basic and Diluted Earnings Per Share

Reconciliation of Basic and Diluted
Earnings Per Share						Dilutive
Year Ended December 31			Basic			Securities			Diluted
Millions Except Per Share Amounts
2023
Net Income Attributable to ALLETE			$247.1						$247.1
Average Common Shares			57.3			0.1			57.4
Earnings Per Share			$4.31						$4.30
2022
Net Income Attributable to ALLETE			$189.3						$189.3
Average Common Shares			55.9			0.1			56.0
Earnings Per Share			$3.38						$3.38
2021
Net Income Attributable to ALLETE			$169.2						$169.2
Average Common Shares			52.4			0.1			52.5
Earnings Per Share			$3.23						$3.23

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Tabular disclosure of the change in common stock outstanding.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482662/260-10-50-1

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