XML 6 R1.htm IDEA: XBRL DOCUMENT v3.22.2.2
Cover
Aug. 22, 2022
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Aug. 22, 2022
Entity Registrant Name ALLETE, Inc
Entity Tax Identification Number 41-0418150
Entity Incorporation, State or Country Code MN
Entity File Number 1-3548
Entity Address, Address Line One 30 West Superior Street
Entity Address, City or Town Duluth
Entity Address, State or Province MN
Entity Address, Postal Zip Code 55802-2093
City Area Code 218
Local Phone Number 279-5000
Pre-commencement Issuer Tender Offer false
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Security Exchange Name NYSE
Title of 12(b) Security Common Stock, without par value
Trading Symbol ALE
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000066756