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Operations and Significant Accounting Policies (Details) - USD ($) shares in Millions, $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 22, 2016 | Sep. 30, 2016 | May 23, 2016 | Dec. 31, 2015
Inventories [Abstract] |  |  |  |  |  |  |
Fuel | [1] |  | $ 45.9 |  |  | $ 58.1 |
Materials and Supplies |  |  | 49.8 |  |  | 49.1 |
Raw Materials |  |  | 3.3 |  |  | 2.7 |
Work in Progress |  |  | 1.1 |  |  | 0.0 |
Finished Goods |  |  | 7.8 |  |  | 7.5 |
Reserve for Obsolescence |  |  | (0.5) |  |  | (0.3) |
Total Inventories |  |  | 107.4 |  |  | 117.1 |
Prepayments and Other Current Assets [Abstract] |  |  |  |  |  |  |
Deferred Fuel Adjustment Clause |  |  | 16.8 |  |  | 10.6 |
Restricted Cash | [2] |  | 7.0 |  |  | 5.6 |
Other |  |  | 15.1 |  |  | 19.5 |
Total Prepayments and Other Current Assets |  |  | 38.9 |  |  | 35.7 |
Other Non-Current Assets [Abstract] |  |  |  |  |  |  |
Contract Payment |  |  | 30.1 | [3] | $ 31.0 | 0.0 | [3]
Finance Receivable | [4] |  | 11.6 |  |  | 0.0 |
Restricted Cash | [5] |  | 4.6 |  |  | 8.1 |
Other |  |  | 60.2 |  |  | 60.0 |
Total Other Non-Current Assets |  |  | 106.5 |  |  | 68.1 |
Real Estate Sale Consideration [Abstract] |  |  |  |  |  |  |
Total Consideration for Land Inventory |  | $ 21.0 |  |  |  |  |
Down Payment of ALLETE Common Stock, Shares |  | 0.1 |  |  |  |  |
Down Payment of ALLETE Common Stock, Value |  | $ 8.0 | 8.0 |  |  |  |
Other Current Liabilites [Abstract] |  |  |  |  |  |  |
Customer Deposits |  |  | 9.0 |  |  | 15.1 |
Power Purchase Agreements |  |  | 24.3 |  |  | 23.3 |
Other |  |  | 60.3 |  |  | 47.7 |
Total Other Current Liabilities |  |  | 93.6 |  |  | 86.1 |
Other Non-Current Liabilities [Abstract] |  |  |  |  |  |  |
Asset Retirement Obligation |  |  | 136.5 |  |  | 131.4 |
Power Purchase Agreements |  |  | 119.8 |  |  | 138.1 |
Contingent Consideration | [6] |  | 37.9 |  |  | 36.6 |
Other |  |  | 41.7 |  |  | 42.9 |
Total Other Non-Current Liabilities |  |  | $ 335.9 |  |  | $ 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] | Contract Payment includes a $31.0 million payment made to Cliffs as part of a long-term power sales agreement between Minnesota Power and Silver Bay Power. The contract payment will be amortized over the term of the sales agreement. (See Note 13. Commitments, Guarantees and Contingencies.)
[4] | On September 22, 2016, ALLETE Properties sold its Ormond Crossings project and Lake Swamp wetland mitigation bank for consideration of approximately $21 million. The consideration included a down payment in the form of 0.1 million shares of ALLETE common stock with a value of $8.0 million. The remaining purchase price will be paid under the terms of a finance receivable due over a five-year period which bears interest at market rates and is collateralized by the property sold.
[5] | Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and PPAs.
[6] | 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.)

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Period Type: | duration