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Acquisition (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 11, 2014 | Jan. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Jan. 30, 2014 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | $ 26.9 |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 3.8 |  |  |  |  |
Other Current Assets |  | 14.3 |  |  |  |  |
Property, Plant and Equipment - Net |  | 156.9 |  |  |  |  |
Other Non-Current Assets |  | 7.5 | [1] |  |  |  |
Total Assets Acquired |  | 182.5 |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Other Current Liabilities |  | 15.2 | [2] |  |  |  |
Long-term Debt Due Within One Year |  | 2.2 |  |  |  |  |
Long-term Debt |  | 21.1 |  |  |  |  |
Power Purchase Agreements |  | 99.4 |  | 93.4 | [3] | 0 | [3]
Other Non-Current Liabilities |  | 10.6 |  |  |  |  |
Non-Controlling Interest |  | 7.1 | [4] |  |  |  |
Total Liabilities and Non-Controlling Interest Assumed |  | 155.6 |  |  |  |  |
Net Identifiable Assets Acquired |  | 26.9 |  |  |  |  |
Power Purchase Agreements |  | 12.4 |  | 12.7 | [3] | 0 | [3]
Business Combination, Acquisition Related Costs |  |  |  | 1.4 |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | 6.0 |  |  |  |  |  |
Armenia Mountain [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Armenia Mountain |  |  |
Generating Capacity (MW) |  |  |  | 101 |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Purchase option |  | 0.3 |  |  |  |  |
Goodwill |  | $ 2.9 |  |  |  |  |
Lake Benton [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Lake Benton |  |  |
Generating Capacity (MW) |  |  |  | 104 |  |  |
Storm Lake [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Storm Lake |  |  |
Generating Capacity (MW) |  |  |  | 77 |  |  |
Condon [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Condon |  |  |
Generating Capacity (MW) |  |  |  | 50 |  |  |
[1] | Included in Other Non-Current Assets was $0.3 million for the option to purchase Armenia Mountain in 2015, and goodwill of $2.9 million; for tax purposes, the purchase price allocation resulted in no allocation to goodwill.
[2] | Other Current Liabilities included $12.4 million related to the current liabilities portion of the Power Purchase Agreements.
[3] | Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisition on January 30, 2014 (see Note 4. Acquisition).
[4] | The purchase price accounting valued the non-controlling interest of Lake Benton, Storm Lake and Condon at fair value using the discounted cash flow method. The non-controlling interest related to Lake Benton and Storm Lake was subsequently purchased by ALLETE Clean Energy.

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