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Common Stock and Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Common Stock [Table Text Block]

Summary of Common Stock	Shares		Equity
	Thousands		Millions
Balance as of December 31, 2016	49,560			$1,295.3
Employee Stock Purchase Plan	12		0.8
Invest Direct	257		19.0
Options and Stock Awards	22		3.6
Contributions to RSOP	50		3.5
Equity Issuance Program	1,000		65.7
Contributions to Pension	216		13.5
Balance as of December 31, 2017	51,117		1,401.4
Employee Stock Purchase Plan	11		0.8
Invest Direct	277		20.7
Options and Stock Awards	57		2.1
Contributions to RSOP	47		3.5
Balance as of December 31, 2018	51,509		1,428.5
Employee Stock Purchase Plan	8		0.7
Invest Direct	38		3.0
Options and Stock Awards	85		1.3
Contributions to RSOP	39		3.2
Balance as of December 31, 2019	51,679			$1,436.7

Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block]

Reconciliation of Basic and Diluted
Earnings Per Share				Dilutive
Year Ended December 31	Basic			Securities		Diluted
Millions Except Per Share Amounts
2019
Net Income Attributable to ALLETE		$185.6					$185.6
Average Common Shares	51.6			0.1		51.7
Earnings Per Share		$3.59					$3.59
2018
Net Income Attributable to ALLETE		$174.1					$174.1
Average Common Shares	51.3			0.2		51.5
Earnings Per Share		$3.39					$3.38
2017
Net Income Attributable to ALLETE		$172.2					$172.2
Average Common Shares	50.8			0.2		51.0
Earnings Per Share		$3.39					$3.38

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- References

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- Definition

Tabular disclosure of the change in common stock outstanding.

+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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