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Common Stock and Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Summary of Common Stock [Table Text Block]
Summary of Common StockSharesEquity
 ThousandsMillions
Balance as of December 31, 201851,509 $1,428.5 
Employee Stock Purchase Plan8 0.7 
Invest Direct38 3.0 
Options and Stock Awards85 1.3 
Contributions to RSOP39 3.2 
Balance as of December 31, 201951,679 1,436.7 
Employee Stock Purchase Plan13 0.7 
Invest Direct309 18.3 
Options and Stock Awards35 2.2 
Contributions to RSOP49 3.0 
Balance as of December 31, 202052,085 1,460.9 
Employee Stock Purchase Plan17 0.8 
Invest Direct263 17.5 
Options and Stock Awards49 3.4 
Contributions to RSOP24 3.1 
Equity Issuance Program782 51.0 
Balance as of December 31, 202153,220 $1,536.7 
Reconciliation of Basic and Diluted Earnings Per Share [Table Text Block]
Reconciliation of Basic and Diluted   
Earnings Per Share Dilutive 
Year Ended December 31BasicSecuritiesDiluted
Millions Except Per Share Amounts   
2021   
Net Income Attributable to ALLETE$169.2 $169.2 
Average Common Shares52.4 0.1 52.5 
Earnings Per Share$3.23 $3.23 
2020   
Net Income Attributable to ALLETE$174.2 $174.2 
Average Common Shares51.9 — 51.9 
Earnings Per Share$3.36 $3.35 
2019   
Net Income Attributable to ALLETE$185.6 $185.6 
Average Common Shares51.6 0.1 51.7 
Earnings Per Share$3.59 $3.59