XML 60 R48.htm IDEA: XBRL DOCUMENT v3.22.2
Earnings Per Share and Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 05, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]          
Net Income Attributable to ALLETE   $ 37.6 $ 27.9 $ 103.9 $ 79.7
Net Income Attributable to ALLETE   $ 37.6 $ 27.9 $ 103.9 $ 79.7
Basic (Shares)   56,100 52,200 54,900 52,200
Dilutive Securities (Shares)   0 100 0 0
Diluted (Shares)   56,100 52,300 54,900 52,200
Basic Earnings Per Share of Common Stock   $ 0.67 $ 0.53 $ 1.89 $ 1.53
Diluted Earnings Per Share of Common Stock   $ 0.67 $ 0.53 $ 1.89 $ 1.53
Proceeds from Issuance or Sale of Equity $ 224.0        
Stock Issued During Period, Shares, New Issues 3,700