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Operations and Significant Accounting Policies (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Inventories [Abstract]    
Fuel [1] $ 56.5 $ 58.1
Materials and Supplies 49.0 49.1
Raw Materials 2.6 2.7
Work in Progress 0.8 0.0
Finished Goods 7.4 7.5
Reserve for Obsolescence (0.3) (0.3)
Total Inventories 116.0 117.1
Prepayments and Other Current Assets [Abstract]    
Deferred Fuel Adjustment Clause 12.4 10.6
Restricted Cash [2] 11.5 5.6
Other 17.6 19.5
Total Prepayments and Other Current Assets 41.5 35.7
Other Non-Current Assets [Abstract]    
Restricted Cash - Non-Current 8.1 8.1
Other Current Liabilites [Abstract]    
Customer Deposits 14.0 15.1
Power Purchase Agreements 23.6 23.3
Other 45.2 47.7
Total Other Current Liabilities 82.8 86.1
Other Non-Current Liabilities [Abstract]    
Asset Retirement Obligation 136.2 131.4
Power Purchase Agreements 131.9 138.1
Contingent Consideration [3] 36.7 36.6
Other 42.3 42.9
Total Other Non-Current Liabilities $ 347.1 $ 349.0
[1] Fuel consists primarily of coal inventory at Minnesota Power.
[2] Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and cash pledged as collateral for U.S. Water Services’ standby letters of credit.
[3] Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 3. Acquisitions and Note 5. Fair Value.)