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Operations and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Cash, Cash Equivalents and Restricted Cash [Table Text Block]

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheet that aggregate to the amounts presented in the Consolidated Statement of Cash Flows.

Cash, Cash Equivalents and Restricted Cash			March 31, 2023						December 31, 2022						March 31, 2022						December 31, 2021
Millions
Cash and Cash Equivalents			$29.9						$36.4						$60.1						$45.1
Restricted Cash included in Prepayments and Other			7.4						1.5						7.1						0.3
Restricted Cash included in Other Non-Current Assets			2.3						2.3						7.8						2.3
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows			$39.6						$40.2						$75.0						$47.7

Inventories – Net [Table Text Block]

Inventories – Net			March 31, 2023						December 31, 2022
Millions
Fuel (a)			$39.6						$33.4
Materials and Supplies			119.2						75.1
Renewable Energy Facilities Under Development (b)			188.1						347.4
Total Inventories – Net			$346.9						$455.9

(a)    Fuel consists primarily of coal inventory at Minnesota Power.

(b)    Renewable Energy Facilities Under Development consists primarily of project costs related to ALLETE Clean Energy’s Northern Wind project sold in the first quarter of 2023 and Red Barn wind project sold in April 2023. (See Other Current Liabilities.)

Other Non-Current Assets [Table Text Block]

Other Non-Current Assets			March 31, 2023						December 31, 2022
Millions
Contract Assets (a)			$20.3						$21.0
Operating Lease Right-of-use Assets			11.8						12.7
ALLETE Properties			19.5						19.1
Restricted Cash			2.3						2.3
Other Postretirement Benefit Plans			59.6						58.8
Other			93.5						90.4
Total Other Non-Current Assets			$207.0						$204.3

(a)    Contract Assets consist of payments made to customers as an incentive to execute or extend service agreements. The contract payments are being amortized over the term of the respective agreements as a reduction to revenue.

Other Current Liabilities [Table Text Block]

Other Current Liabilities			March 31, 2023						December 31, 2022
Millions
Customer Deposits (a)			$10.3						$150.7
PSAs			6.1						6.1
Provision for Interim Rate Refund			23.5						18.4
Manufactured Gas Plant (b)			14.5						14.7
Operating Lease Liabilities			3.0						3.2
Other			49.4						57.9
Total Other Current Liabilities			$106.8						$251.0

(a) Primarily related to deposits received by ALLETE Clean Energy for the Northern Wind and Red Barn wind projects sold in the first quarter of 2023 and April 2023, respectively. (See Inventories – Net.)

(b) The manufactured gas plant represents the current liability for remediation of a former manufactured gas plant site located in Superior, Wisconsin, and formerly operated by SWL&P.

Other Non-Current Liabilities [Table Text Block]

Other Non-Current Liabilities			March 31, 2023						December 31, 2022
Millions
Asset Retirement Obligation (a)			$204.4						$200.4
PSAs			25.4						26.9
Operating Lease Liabilities			8.8						9.3
Other			31.8						32.4
Total Other Non-Current Liabilities			$270.4						$269.0

(a)The asset retirement obligation is primarily related to our Regulated Operations and is funded through customer rates over the life of the related assets. Additionally, BNI Energy funds its obligation through its cost-plus coal supply agreements for which BNI Energy has recorded a receivable of $32.4 million in Other Non-Current Assets on the Consolidated Balance Sheet as of March 31, 2023, ($32.4 million as of December 31, 2022).

Other Income [Table Text Block]

									Three Months Ended
									March 31
Other Income												2023			2022
Millions
Pension and Other Postretirement Benefit Plan Non-Service Credits (a)												$2.0			$2.6
Interest and Investment Income												1.1			0.1
AFUDC - Equity												0.5			0.9
Other												0.5			(1.6)
Total Other Income												$4.1			$2.0

(a)These are components of net periodic pension and other postretirement benefit cost other than service cost. (See Note 9. Pension and Other Postretirement Benefit Plans.)

Supplemental Statement of Cash Flows Information [Table Text Block]

Supplemental Statement of Cash Flows Information.

Three Months Ended March 31,			2023						2022
Millions
Cash Paid for Interest – Net of Amounts Capitalized			$24.6						$22.4
Cash Paid for Income Taxes			—						$0.3
Noncash Investing and Financing Activities
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment			$(7.1)						$(24.5)
Capitalized Asset Retirement Costs			$2.4						$3.0
AFUDC–Equity			$0.5						$0.9

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