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Operations and Significant Accounting Policies - Balance Sheet and Income Statement Disclosures (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivable [Abstract]        
Billed   $ 112.6 $ 106.5  
Unbilled   24.6 19.1  
Less: Allowance for Doubtful Accounts   2.1 3.1  
Total Accounts Receivable   135.1 122.5  
Inventories – Net [Abstract]        
Fuel [1]   34.8 43.9  
Materials and Supplies   46.5 48.7  
Raw Materials   2.8 2.9  
Work in Progress   4.2 1.0  
Finished Goods   8.3 8.6  
Reserve for Obsolescence   (0.7) (0.9)  
Total Inventories   95.9 104.2  
Prepayments and Other Current Assets [Abstract]        
Deferred Fuel Adjustment Clause [2]   0.0 18.6  
Restricted Cash [3]   2.6 2.2  
Other   35.0 19.5  
Total Prepayments and Other Current Assets   37.6 40.3  
Impairment of Long-Lived Assets [Abstract]        
Impairment of Real Estate   0.0 0.0 $ 36.3
Goodwill [Line Items]        
Impairment of Goodwill   0.0 3.3 [4] 0.0
Indefinite-Lived Intangible Assets [Abstract]        
Impairment of Intangible Assets   0.0 0.0 0.0
Other Non-Current Assets [Abstract]        
Contract Payment [5]   27.5 29.6  
Financing Receivable [6]   11.0 11.5  
Restricted Cash [7]   8.6 8.6  
Other   60.6 56.8  
Total Other Non-Current Assets   107.7 106.5  
Real Estate Sale Consideration [Abstract]        
Total Consideration for Land Inventory     $ 21.0  
Down Payment of ALLETE Common Stock (Shares)     0.1  
Down Payment of ALLETE Common Stock     $ 8.0  
Finance Receivable Term (Years)     5 years  
Other Current Liabilities [Abstract]        
PSAs   24.5 $ 24.6  
Other   58.7 49.1  
Total Other Current Liabilities   83.2 73.7  
Other Non-Current Liabilities [Abstract]        
Asset Retirement Obligation   122.7 136.6  
PSAs   89.5 113.8  
Contingent Consideration [8]   5.4 25.0  
Other   49.5 47.3  
Total Other Non-Current Liabilities   267.1 322.7  
Business Segments [Line Items]        
Charge to Fuel, Purchased Power and Gas - Utility   396.9 339.9 336.0
Amortization of Power Sales Agreements   23.6 22.3 23.2
Operating Expenses – Other [Abstract]        
Impairment of Real Estate   0.0 0.0 36.3
Impairment of Goodwill   0.0 3.3 [4] 0.0
Change in Fair Value of Contingent Consideration   (0.7) (13.6) 0.0
Total Operating Expenses – Other   $ (0.7) $ (10.3) $ 36.3
Income Taxes [Abstract]        
More-Likely-Than-Not Percentage   50.00% 50.00%  
Remeasurement of Deferred Income Taxes as a Result of the TCJA [Line Items]        
Statutory Federal Income Tax Rate   35.00% 35.00% 35.00%
Deferred Income Tax Expense (Benefit)   $ 14.4 $ 19.4 $ 25.1
Decrease to Deferred Income Taxes   (353.6) 0.0 0.0
Decrease in Investment in ATC   (27.9) 0.0 0.0
Increase to Regulatory Assets   80.9 0.0 0.0
Increase to Regulatory Liabilities   393.6 0.0 0.0
Income Tax Expense [Member]        
Remeasurement of Deferred Income Taxes as a Result of the TCJA [Line Items]        
Deferred Income Tax Expense (Benefit)   $ (13.0)    
Subsequent Event [Member]        
Remeasurement of Deferred Income Taxes as a Result of the TCJA [Line Items]        
Statutory Federal Income Tax Rate 21.00%      
Regulated Operations [Member]        
Business Segments [Line Items]        
Alternative Revenue Program, Required Collection Period (Months)   24 months    
ALLETE Clean Energy [Member]        
Goodwill [Line Items]        
Impairment of Goodwill     3.3 [4] 0.0
Business Segments [Line Items]        
Amortization of Power Sales Agreements   $ 23.6 22.3 23.2
Operating Expenses – Other [Abstract]        
Impairment of Goodwill     3.3 [4] 0.0
U.S. Water Services [Member]        
Goodwill [Line Items]        
Impairment of Goodwill   $ 0.0 0.0 [4] 0.0
Discount Rate   10.75%    
Revenue Growth Rate Related to Impact of Acquisition   13.00%    
Terminal Growth Rate   4.00%    
Operating Expenses – Other [Abstract]        
Impairment of Goodwill   $ 0.0 $ 0.0 [4] $ 0.0
U.S. Water Services [Member] | Minimum [Member]        
Goodwill [Line Items]        
Annual Revenue Growth Rate   7.00%    
U.S. Water Services [Member] | Maximum [Member]        
Goodwill [Line Items]        
Annual Revenue Growth Rate   9.00%    
Corporate and Other [Member]        
Business Segments [Line Items]        
Minimum Cash Collections Requirement for Real Estate Sales (Percent)   20.00%    
2016 Minnesota General Rate Case [Member] | MPUC [Member] | Minnesota Power [Member]        
Business Segments [Line Items]        
Charge to Fuel, Purchased Power and Gas - Utility   $ 19.5    
2016 Minnesota General Rate Case [Member] | Regulated Operations [Member] | MPUC [Member] | Minnesota Power [Member]        
Business Segments [Line Items]        
Charge to Fuel, Purchased Power and Gas - Utility   $ 19.5    
Developed Technology and Other [Member] | Minimum [Member]        
Definite-Lived Intangible Assets [Line Items]        
Useful Life (Years)   1 year    
Developed Technology and Other [Member] | Maximum [Member]        
Definite-Lived Intangible Assets [Line Items]        
Useful Life (Years)   11 years    
Customer Relationships [Member] | Maximum [Member]        
Definite-Lived Intangible Assets [Line Items]        
Useful Life (Years)   20 years    
[1] Fuel consists primarily of coal inventory at Minnesota Power.
[2] At a hearing on January 18, 2018, the MPUC disallowed recovery of Minnesota Power’s regulatory asset for deferred fuel adjustment clause costs resulting in a $19.5 million pre-tax charge to Fuel, Purchased Power and Gas – Utility in 2017.
[3] Restricted Cash includes collateral deposits required under an ALLETE Clean Energy loan agreement and collateral deposits required for U.S. Water Services’ standby letters of credit.
[4] The facts and circumstances that led to an impairment of ALLETE Clean Energy’s goodwill primarily relate to lower estimated energy prices in periods not under PSAs. Impairment Charge is included in Operating Expenses – Other on the Consolidated Statement of Income. (See Note 1. Operations and Significant Accounting Policies.) ALLETE Clean Energy’s goodwill was primarily related to the acquisition of Storm Lake II in 2014.
[5] Contract Payment includes a payment made to Cliffs as part of a long-term PSA between Minnesota Power and Silver Bay Power. The contract payment is being amortized over the term of the PSA. (See Note 11. Commitments, Guarantees and Contingencies.)
[6] n 2016, ALLETE Properties sold its Ormond Crossings project and Lake Swamp wetland mitigation bank for consideration of approximately $21 million. The consideration included a down payment in the form of 0.1 million shares of ALLETE common stock with a value of $8.0 million. The remaining purchase price will be paid under the terms of a finance receivable due over a five-year period which bears interest at market rates and is collateralized by the property sold.
[7] Restricted Cash includes collateral deposits required under an ALLETE Clean Energy loan agreement and PSAs, and deposits from SWL&P customers in aid of future capital expenditures.
[8] Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 6. Acquisitions and Note 9. Fair Value.)