Regulatory Matters - Integrated Resource Plan (Details) - MW		3 Months Ended
	Oct. 01, 2021	Dec. 31, 2021	Feb. 01, 2021
Natural Gas-Fired [Member] | Nemadji Trail Energy Center [Member]
Regulatory Matters [Line Items]
Generating Capacity Jointly Owned (MW)		600
Natural Gas-Fired [Member] | South Shore Energy | Nemadji Trail Energy Center [Member]
Regulatory Matters [Line Items]
Expected Output Entitlement (Percent)	20.00%	20.00%
MPUC [Member] | Renewable Generation [Member] | 2021 Integrated Resource Plan [Member]
Regulatory Matters [Line Items]
Generating Capacity (MW)			400