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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash, Cash Equivalents and Restricted Cash [Abstract]        
Cash and Cash Equivalents $ 353.3 $ 69.1 $ 98.5 $ 98.9
Restricted Cash included in Prepayments and Other 7.2 1.3 8.8 2.6
Restricted Cash included in Other Non-Current Assets 4.7 8.6 8.6 8.6
Total Cash, Cash Equivalents and Restricted Cash 365.2 79.0 $ 115.9 $ 110.1
Inventories – Net [Abstract]        
Fuel [1] 29.4 26.0    
Materials and Supplies 44.4 44.2    
Raw Materials (b) [2] 0.0 2.8    
Work in Progress (b) [2] 0.0 6.1    
Finished Goods (b) [2] 0.0 8.4    
Reserve for Obsolescence (b) [2] 0.0 (0.8)    
Total Inventories – Net 73.8 86.7    
Other Non-Current Assets [Abstract]        
Contract Assets [3] 29.8 30.7    
Finance Receivable 10.4 10.4    
Operating Lease, Right-of-Use Asset [4] 34.0 0.0    
ALLETE Properties 24.0 24.4    
Other 82.7 86.9    
Total Other Non-Current Assets 180.9 152.4    
Other Current Liabilites [Abstract]        
Provision for Interim Rate Refund [5] 40.6 40.0    
PSAs 12.4 12.6    
Contract Liabilities [6] 0.4 7.6    
Provision for Tax Reform Refunds [7] 0.5 10.7    
Contingent Consideration [8] 0.0 3.8    
Operating Lease Liabilities 8.4 0.0    
Other 36.2 53.8    
Total Other Current Liabilities 98.5 128.5    
Other Non-Current Liabilities [Abstract]        
Asset Retirement Obligation 142.0 138.6    
PSAs 73.9 76.9    
Operating Lease Liabilities 25.6 0.0    
Other 46.4 47.1    
Total Other Non-Current Liabilities $ 287.9 $ 262.6    
[1] Fuel consists primarily of coal inventory at Minnesota Power.
[2] On March 26, 2019, ALLETE completed the sale of U.S. Water Services which resulted in the removal of the related inventory items from the Consolidated Balance Sheet.
[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 as a reduction to revenue.
[4] See Leases.
[5] Provision for Interim Rate Refund is expected to be refunded to Minnesota Power’s regulated retail customers in the second quarter of 2019
[6] Contract Liabilities include deposits received as a result of entering into contracts with our customers prior to completing our performance obligations.
[7] Provision for Tax Reform Refund related to the income tax benefits of the TCJA in 2018 was refunded to Minnesota Power customers in the first quarter of 2019 and will be refunded to SWL&P customers in 2019 and 2020.
[8] Contingent Consideration related to the earnings-based payment resulting from the U.S. Water Services acquisition was paid in the first quarter of 2019.