Regulatory Matters - Minnesota Solar Energy Standard (Details) $ in Millions	Dec. 31, 2022 USD ($) MW
Minnesota Power [Member] | Solar Generation
Regulatory Matters [Line Items]
Anticipated Generating Capacity to be Purchased (MW)	20
Corporate & Other - Other [Member] | Solar Generation
Regulatory Matters [Line Items]
Estimated Investment Amount | $	$ 40
MPUC [Member]
Regulatory Matters [Line Items]
Minnesota Solar Energy Standard - Overall Mandate Percentage	1.50%
MPUC [Member] | Minimum [Member]
Regulatory Matters [Line Items]
Minnesota Solar Energy Standard - Overall Mandate Percentage	1.50%
Minnesota Solar Energy Standard - Small Scale Solar Mandate Percentage	10.00%
MPUC [Member] | Maximum [Member]
Regulatory Matters [Line Items]
Minnesota Solar Energy Standard - Qualifying Capacity for Small Scale Solar Mandate (MW)	0.04