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Operations and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
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 31202020192018
Millions
Cash and Cash Equivalents$44.3 $69.3 $69.1 
Restricted Cash included in Prepayments and Other 0.8 2.8 1.3 
Restricted Cash included in Other Non-Current Assets20.1 20.4 8.6 
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows$65.2 $92.5 $79.0 
Supplemental Statement of Cash Flow Information [Table Text Block]
Supplemental Statement of Cash Flow Information.
Consolidated Statement of Cash Flows
Year Ended December 31202020192018
Millions  
Cash Paid During the Period for Interest – Net of Amounts Capitalized$62.0 $63.5 $66.0 
Recognition of Right-of-use Assets and Lease Liabilities (a)
— $28.7— 
Noncash Investing and Financing Activities
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment$(67.0)$33.9$(0.1)
Reclassification of Property, Plant and Equipment to Inventory (b)
— — $46.3 
Capitalized Asset Retirement Costs$4.1$20.7$14.2
AFUDC–Equity$1.9 $2.3 $1.2 
(a)Amount of the right-of-use asset and lease liability recognized with the adoption of an accounting standards update for leases.
(b)In 2018, Montana-Dakota Utilities exercised its option to purchase the Thunder Spirit II wind energy facility upon completion, resulting in a reclassification from Property, Plant and Equipment – Net to Inventories – Net for project costs incurred in the prior year. On the Consolidated Statement of Cash Flows, the sale of the wind energy facility in 2018 resulted in Operating Activities – Inventories increasing by $46.3 million in 2018 due to the project costs incurred in the prior year.
Accounts Receivable [Table Text Block]
Accounts Receivable
As of December 3120202019
Millions
Trade Accounts Receivable
Billed$93.5 $77.2 
Unbilled20.9 20.1 
Less: Allowance for Doubtful Accounts2.5 0.9 
Total Accounts Receivable$111.9 $96.4 
Inventories – Net [Table Text Block]
Inventories – Net
As of December 3120202019
Millions  
Fuel (a)
$23.1 $25.9 
Materials and Supplies51.1 46.9 
Total Inventories – Net$74.2 $72.8 
(a)    Fuel consists primarily of coal inventory at Minnesota Power.
Other Non-Current Assets [Table Text Block]
Other Non-Current Assets
As of December 3120202019
Millions
Contract Assets (a)
$25.5 $28.0 
Operating Lease Right-of-use Assets22.4 28.6 
ALLETE Properties18.2 21.9 
Restricted Cash20.1 20.4 
Other Postretirement Benefit Plans34.2 37.5 
Other86.4 81.8 
Total Other Non-Current Assets$206.8 $218.2 
(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 3120202019
Millions  
PSAs$12.5 $12.3 
Fuel Adjustment Clause (a)
3.7 — 
Operating Lease Liabilities5.9 6.9 
Other44.6 41.2 
Total Other Current Liabilities$66.7 $60.4 
(a) See Note 4. Regulatory Matters.
Other Non-Current Liabilities [Table Text Block]
Other Non-Current Liabilities
As of December 3120202019
Millions  
Asset Retirement Obligation $166.6 $160.3 
PSAs52.1 64.6 
Operating Lease Liabilities16.5 21.8 
Other50.1 46.3 
Total Other Non-Current Liabilities$285.3 $293.0 
Lease, Cost [Table Text Block]
Additional information on the components of lease cost and presentation of cash flows were as follows:
As December 3120202019
Millions
Operating Lease Cost$8.3 $9.4 
Other Information:
Operating Cash Flows From Operating Leases$8.3 $9.4 

Additional information related to leases was as follows:
As of December 3120202019
Millions
Balance Sheet Information Related to Leases:
Other Non-Current Assets$22.4$28.6
Total Operating Lease Right-of-use Assets$22.4$28.6
Other Current Liabilities$5.9$6.9
Other Non-Current Liabilities16.521.8
Total Operating Lease Liabilities$22.4$28.7
Weighted Average Remaining Lease Term (Years):
Operating Leases - Vehicles and Equipment34
Operating Leases - Land and Other2728
Weighted Average Discount Rate:
Operating Leases - Vehicles and Equipment3.1 %3.7 %
Operating Leases - Land and Other4.1 %4.1 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Maturities of lease liabilities were as follows:
December 31, 2020
Millions
2021$6.0 
20225.0 
20233.2 
20242.9 
20252.9 
Thereafter8.6 
Total Lease Payments Due28.6 
Less: Imputed Interest6.2 
Total Lease Obligations22.4 
Less: Current Lease Obligations5.9 
Total Long-term Lease Obligations$16.5 
Other Income (Expense) - Other [Table Text Block]
Other Income (Expense) - Other
Year Ended December 31202020192018
Millions
Pension and Other Postretirement Benefit Plan Non-Service Credit (a)
$8.6 $7.7 $4.6 
Interest and Investment Earnings1.6 4.4 0.5 
AFUDC - Equity1.9 2.3 1.2 
Gain on Land Sales0.4 2.1 0.9 
Other2.2 2.2 0.6 
Total Other Income (Expense) - Other$14.7 $18.7 $7.8 
(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.)