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Operations and Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cash, Cash Equivalents and Restricted Cash 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 CashMarch 31,
2024		December 31,
2023		March 31,
2023		December 31,
2022
Millions  
Cash and Cash Equivalents$32.0 $71.9 $29.9 $36.4 
Restricted Cash included in Prepayments and Other 5.9 5.1 7.4 1.5 
Restricted Cash included in Other Non-Current Assets2.4 2.4 2.3 2.3 
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows$40.3 $79.4 $39.6 $40.2 
Inventories – Net Inventories in our ALLETE Clean Energy segment and Corporate and Other businesses are carried at an average cost, first-in, first-out or specific identification basis.
Inventories – NetMarch 31,
2024		December 31,
2023
Millions  
Fuel (a)
$30.2 $27.2 
Materials and Supplies 119.0 115.7 
Renewable Energy Facilities Under Development (b)
33.5 32.5 
Total Inventories – Net$182.7 $175.4 
(a)    Fuel consists primarily of coal inventory at Minnesota Power.
(b)    Renewable Energy Facilities Under Development as of March 31, 2024, consists primarily of project costs related to renewable energy development projects at New Energy.
Other Non-Current Assets
Other Non-Current AssetsMarch 31,
2024		December 31,
2023
Millions
Other Postretirement Benefit Plans$104.6 $106.3 
Contract Assets (a)
17.9 18.5 
Operating Lease Right-of-use Assets11.3 10.7 
ALLETE Properties10.7 10.8 
Restricted Cash2.4 2.4 
Finance Lease Right-of-use Assets2.0 2.1 
Other115.9 112.1 
Total Other Non-Current Assets$264.8 $262.9 
(a)    Contract Assets consist of payments made to customers as an incentive to execute or extend service agreements. The payments are being amortized over the term of the respective agreements as a reduction to revenue.
Other Current Liabilities
Other Current LiabilitiesMarch 31,
2024		December 31,
2023
Millions  
PSAs$6.0 $6.0 
Customer Deposits5.7 7.4 
Provision for Interim Rate Refund 5.5 — 
Operating Lease Liabilities3.1 3.0 
Finance Lease Liabilities0.4 0.4 
Other59.5 75.1 
Total Other Current Liabilities$80.2 $91.9 
Other Non-Current Liabilities
Other Non-Current LiabilitiesMarch 31,
2024		December 31,
2023
Millions  
Asset Retirement Obligation (a)
$206.1 $202.9 
PSAs19.5 20.9 
Operating Lease Liabilities8.3 7.7 
Finance Lease Liabilities1.5 1.6 
Other32.6 31.2 
Total Other Non-Current Liabilities$268.0 $264.3 
(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 $37.2 million in Other Non-Current Assets on the Consolidated Balance Sheet as of March 31, 2024 ($37.2 million as of December 31, 2023).
Other Income
Three Months Ended
March 31,
Other Income20242023
Millions
Pension and Other Postretirement Benefit Plan Non-Service Credits (a)
$4.3 $2.0 
Interest and Investment Income1.9 1.1 
AFUDC - Equity1.2 0.5 
Other1.2 0.5 
Total Other Income$8.6 $4.1 
(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
Three Months Ended
March 31,
Supplemental Statement of Cash Flows Information20242023
Millions  
Cash Paid for Interest – Net of Amounts Capitalized$25.7$24.6
Noncash Investing and Financing Activities  
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment$(5.9)$(7.1)
Capitalized Asset Retirement Costs$2.2$2.4
AFUDC–Equity$1.2$0.5