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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash, Cash Equivalents and Restricted Cash [Abstract]        
Cash and Cash Equivalents $ 98.5 $ 98.9 $ 81.8 $ 27.5
Restricted Cash included in Prepayments and Other 8.8 2.6 9.1 2.2
Restricted Cash included in Other Non-Current Assets 8.6 8.6 8.6 8.6
Total Cash, Cash Equivalents and Restricted Cash 115.9 110.1 $ 99.5 $ 38.3
Inventories – Net [Abstract]        
Fuel [1] 33.8 34.8    
Materials and Supplies 46.9 46.5    
Construction of Wind Energy Facility [2] 46.9 0.0    
Raw Materials 2.8 2.8    
Work in Progress 4.2 4.2    
Finished Goods 9.3 8.3    
Reserve for Obsolescence (0.8) (0.7)    
Total Inventories – Net 143.1 95.9    
Other Non-Current Assets [Abstract]        
Contract Assets [3] 31.0 31.6    
Finance Receivable 10.9 11.0    
Other 67.1 65.1    
Total Other Non-Current Assets 109.0 107.7    
Other Current Liabilites [Abstract]        
Provision for Interim Rate Refund [4] 28.1 0.0    
PSAs 21.5 24.5    
Contract Liabilities [5] 20.0 8.7    
Provision for Tax Reform Refunds [6] 7.5 0.0    
Contingent Consideration - Current [7] 5.5 0.0    
Other 47.6 50.0    
Total Other Current Liabilities 130.2 83.2    
Other Non-Current Liabilities [Abstract]        
Asset Retirement Obligation 122.9 122.7    
PSAs 86.3 89.5    
Contingent Consideration - Non-current [8] 0.0 5.4    
Other 48.6 49.5    
Total Other Non-Current Liabilities $ 257.8 $ 267.1    
[1] Fuel consists primarily of coal inventory at Minnesota Power.
[2] On February 28, 2018, Montana-Dakota Utilities exercised its option to purchase the Thunder Spirit II wind energy facility upon completion, resulting in a reclassification of the project value from Property, Plant and Equipment – Net to Inventory – Net as ALLETE Clean Energy will no longer own and operate the facility upon completion.
[3] 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.
[4] Provision for Interim Rate Refund is expected to be refunded to Minnesota Power’s regulated retail customers in the first quarter of 2019. (See Note 6. Regulatory Matters.)
[5] Contract Liabilities include deposits received as a result of entering into contracts with our customers prior to completing our performance obligations.
[6] Provision for Tax Reform Refund is deferred as a regulatory liability pending the outcome of regulatory proceedings with the MPUC and PSCW. (See Note 6. Regulatory Matters.)
[7] Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 5. Fair Value.)
[8] Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 5. Fair Value.)