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Acquisitions - Wind Development Project (Details)
$ in Millions
 9 Months Ended
Nov. 20, 2014
USD ($)
MW
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Assets [Abstract]      
Construction Costs [1]   $ 0.0 $ 48.2
Goodwill   131.0 2.9
Billings in Excess of Costs and Estimated Earnings [Abstract]      
Contract Billings [2]   0.0 54.3
Construction Costs [1]   0.0 48.2
Billings in Excess of Costs and Estimated Earnings [3]   8.8 0.0
Wind Development Project [Member]      
Business Acquisition [Line Items]      
Date of Acquisition Nov. 20, 2014    
Payments to Acquire Business $ 27.0    
Generating Capacity (MW) | MW 107    
Number of Wind Turbines 43    
Contractual Sales Price $ 200.0    
Assets [Abstract]      
Cash and Cash Equivalents 3.6    
Construction Costs 23.4 137.5 48.2
Goodwill 0.0    
Liabilities [Abstract]      
Total Liabilities Assumed 0.0    
Billings in Excess of Costs and Estimated Earnings [Abstract]      
Contract Billings   169.7 54.3
Construction Costs $ 23.4 137.5 $ 48.2
Estimated Earnings   23.4  
Billings in Excess of Costs and Estimated Earnings [4]   8.8  
Revenue   156.4  
Cost of Sales   $ 133.0  
[1] Construction Costs for Development Project relate to ALLETE Clean Energy’s project to develop and construct a wind energy facility in 2015. Beginning in the second quarter of 2015, these costs have been net against contract billings. (See Billings in Excess of Costs and Estimated Earnings in Other Current Liabilities table and Note 4. Acquisitions.)
[2] Construction Deposits Received for Development Project relate to ALLETE Clean Energy’s project to develop and construct a wind energy facility in 2015. Beginning in the second quarter of 2015, these deposits have been net against contract costs and estimated gross profit. (See Billings in Excess of Costs and Estimated Earnings below and Note 4. Acquisitions.)
[3] Billings in Excess of Costs and Estimated Earnings represents the excess of contract billings over the construction costs incurred and estimated earnings recognized. In the second quarter of 2015, the NDPSC approved the sale agreement ALLETE Clean Energy has with Montana-Dakota Utilities to develop, construct, and sell a wind energy facility in 2015. (See Note 4. Acquisitions.)
[4] Included in Current Liabilities - Other on the Consolidated Balance Sheet.