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Operations and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cash, Cash Equivalents and Restricted Cash [Table Text Block]
Cash, Cash Equivalents and Restricted Cash
As of December 31202120202019
Millions
Cash and Cash Equivalents$45.1 $44.3 $69.3 
Restricted Cash included in Prepayments and Other 0.3 0.8 2.8 
Restricted Cash included in Other Non-Current Assets2.3 20.1 20.4 
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows$47.7 $65.2 $92.5 
Supplemental Statement of Cash Flow Information [Table Text Block]
Supplemental Statement of Cash Flow Information.
Consolidated Statement of Cash Flows
Year Ended December 31202120202019
Millions  
Cash Paid During the Period for Interest – Net of Amounts Capitalized$66.8 $62.0 $63.5 
Recognition of Right-of-use Assets and Lease Liabilities (a)
— — 28.7 
Noncash Investing and Financing Activities
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment$(14.0)$(67.0)$33.9 
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities (b)
$30.6 — — 
Capitalized Asset Retirement Costs$16.9 $4.1 $20.7 
AFUDC–Equity$2.6 $1.9 $2.3 
(a)Amount of the right-of-use asset and lease liability recognized with the adoption of an accounting standards update for leases.
(b)Amount reclassified to Current Liabilities resulting from the exercise of an option to buy out a non-controlling interest.
Accounts Receivable [Table Text Block]
Accounts Receivable
As of December 3120212020
Millions
Trade Accounts Receivable
Billed$100.8 $93.5 
Unbilled24.7 20.9 
Less: Allowance for Doubtful Accounts1.8 2.5 
Total Accounts Receivable$123.7 $111.9 
Inventories – Net [Table Text Block]
Inventories – Net
As of December 3120212020
Millions  
Fuel (a)
$18.7 $23.1 
Materials and Supplies56.1 51.1 
Construction of Wind Energy Facilities (b)
22.9 — 
Total Inventories – Net$97.7 $74.2 
(a)    Fuel consists primarily of coal inventory at Minnesota Power.
(b) Project costs related to ALLETE Clean Energy’s Northern Wind and Red Barn wind projects which are expected be sold in late 2022 and 2023, respectively. (See Other Current Liabilities.)
Other Non-Current Assets [Table Text Block]
Other Non-Current Assets
As of December 3120212020
Millions
Contract Assets (a)
$23.3 $25.5 
Operating Lease Right-of-use Assets16.4 22.4 
ALLETE Properties19.4 18.2 
Restricted Cash2.3 20.1 
Other Postretirement Benefit Plans64.8 34.2 
Other87.5 86.4 
Total Other Non-Current Assets$213.7 $206.8 
(a)    Contract Assets include 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
As of December 3120212020
Millions  
Customer Deposits (a)
$27.2 $7.4 
PSAs12.6 12.5 
Manufactured Gas Plant (b)
12.8 — 
Fuel Adjustment Clause 5.0 3.7 
Operating Lease Liabilities4.8 5.9 
Redeemable Non-Controlling Interest (c)
30.6 — 
Other40.0 37.2 
Total Other Current Liabilities$133.0 $66.7 
(a)    Primarily related to deposits received by ALLETE Clean Energy for the Northern Wind and Red Barn wind projects which are expected be sold in late 2022 and 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. (See Note 8. Commitments, Guarantees and Contingencies.)
(c) Amount reclassified from Non-Controlling Interest in Subsidiaries resulting from the exercise of an option to buy out a non-controlling interest, which was paid in the first quarter of 2022.
Other Non-Current Liabilities [Table Text Block]
Other Non-Current Liabilities
As of December 3120212020
Millions  
Asset Retirement Obligation $184.5 $166.6 
PSAs39.5 52.1 
Operating Lease Liabilities11.6 16.5 
Other45.2 50.1 
Total Other Non-Current Liabilities$280.8 $285.3 
Lease, Cost [Table Text Block]
Additional information on the components of lease cost and presentation of cash flows were as follows:
As December 3120212020
Millions
Operating Lease Cost$6.7 $8.3 
Other Information:
Operating Cash Flows From Operating Leases$6.7 $8.3 

Additional information related to leases was as follows:
As of December 3120212020
Millions
Balance Sheet Information Related to Leases:
Other Non-Current Assets$16.4$22.4
Total Operating Lease Right-of-use Assets$16.4$22.4
Other Current Liabilities$4.8$5.9
Other Non-Current Liabilities11.616.5
Total Operating Lease Liabilities$16.4$22.4
Weighted Average Remaining Lease Term (Years):
Operating Leases - Vehicles and Equipment33
Operating Leases - Land and Other2727
Weighted Average Discount Rate:
Operating Leases - Vehicles and Equipment3.8 %3.1 %
Operating Leases - Land and Other4.5 %4.1 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Maturities of lease liabilities were as follows:
December 31, 2021
Millions
2022$5.1 
20233.3 
20243.0 
20252.8 
20262.8 
Thereafter5.0 
Total Lease Payments Due22.0 
Less: Imputed Interest5.6 
Total Lease Obligations16.4 
Less: Current Lease Obligations4.8 
Total Long-term Lease Obligations$11.6 
Other Income (Expense) - Other [Table Text Block]
Other Income (Expense) - Other
Year Ended December 31202120202019
Millions
Pension and Other Postretirement Benefit Plan Non-Service Credit (a)
$6.1 $8.6 $7.7 
Interest and Investment Earnings2.3 1.6 4.4 
AFUDC - Equity2.6 1.9 2.3 
Gain on Land Sales0.1 0.4 2.1 
Other(2.4)2.2 2.2 
Total Other Income (Expense) - Other$8.7 $14.7 $18.7 
(a)These are components of net periodic pension and other postretirement benefit cost other than service cost. (See Note 11. Pension and Other Postretirement Benefit Plans.)