Document and Entity Information
Document and Entity Information | Aug. 12, 2020 |
Cover [Abstract] | |
Amendment Flag | false |
Entity Central Index Key | 0000073088 |
Document Type | 8-K |
Document Period End Date | Aug. 12, 2020 |
Entity Registrant Name | NorthWestern Corp |
Entity Incorporation State Country Code | DE |
Entity File Number | 1-10499 |
Entity Tax Identification Number | 46-0172280 |
Entity Address, Address Line One | 3010 W. 69th Street |
Entity Address, City or Town | Sioux Falls |
Entity Address, State or Province | SD |
Entity Address, Postal Zip Code | 57108 |
City Area Code | 605 |
Local Phone Number | 978-2900 |
Security 12b Title | Common stock |
Trading Symbol | NWE |
Security Exchange Name | NYSE |
Written Communications | false |
Soliciting Material | false |
Pre Commencement Tender Offer | false |
Pre Commencement Issuer Tender Offer | false |
Entity Emerging Growth Company | false |