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Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Statement of Cash Flow Information [Table Text Block] | Supplemental Statement of Cash Flow Information
Consolidated Statement of Cash Flows |  |  |
Year Ended December 31 | 2015 |  | 2014 |  | 2013 |
Millions |  |  |
Cash Paid During the Period for Interest – Net of Amounts Capitalized |  | $59.0 |  |  | $51.3 |  |  | $47.5 |
Cash Paid During the Period for Income Taxes |  | $0.4 |  |  | $5.1 |  |  | $0.5 |
Noncash Investing and Financing Activities |  |  |
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment | $(40.6) |  | $21.7 |  |  | $8.3 |
Capitalized Asset Retirement Costs |  | $12.4 |  |  | $22.4 |  | $(0.7)
AFUDC–Equity |  | $3.3 |  |  | $7.8 |  |  | $4.6 |
ALLETE Common Stock Contributed to the Defined Benefit Pension Plan | — |  |  | $19.5 |  | — |
Contingent Consideration |  | $35.7 |  | — |  | — |
Accounts Receivable [Table Text Block] |
Accounts Receivable |  |  |
As of December 31 | 2015 |  |  | 2014 |
Millions |  |  |
Trade Accounts Receivable |  |  |
Billed |  | $105.3 |  |  |  | $85.5 |
Unbilled | 16.9 |  |  | 18.6 |
Less: Allowance for Doubtful Accounts | 1.0 |  |  | 1.1 |
Total Accounts Receivable |  | $121.2 |  |  |  | $103.0 |
Inventories [Table Text Block] |
Inventories |  |  |
As of December 31 | 2015 |  |  | 2014 |
Millions |  |  |
Fuel (a) |  | $58.1 |  |  |  | $29.0 |
Materials and Supplies | 49.1 |  |  | 51.5 |
Raw Materials | 2.7 |  |  | — |
Finished Goods | 7.5 |  |  | — |
Reserve for Obsolescence | (0.3 | ) |  | — |
Total Inventories |  | $117.1 |  |  |  | $80.5 |
(a) | Fuel consists primarily of coal inventory at Minnesota Power. During 2015, Minnesota Power increased its coal inventory to take advantage of favorable pricing.
Prepayments and Other Current Assets [Table Text Block] |
Prepayments and Other Current Assets |  |  |
As of December 31 | 2015 |  |  | 2014 |
Millions |  |  |
Deferred Fuel Adjustment Clause |  | $10.6 |  |  |  | $16.3 |
Construction Costs for Development Project (a) | — |  |  | 48.2 |
Restricted Cash (b) | 5.6 |  |  | 2.7 |
Other | 19.5 |  |  | 14.8 |
Total Prepayments and Other Current Assets |  | $35.7 |  |  |  | $82.0 |
(a) | Construction Costs for Development Project related to ALLETE Clean Energy’s project to construct a wind energy facility which was sold in 2015. (See Note 7. Acquisitions.)
(b) | Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and collateral deposits required for U.S. Water Services’ standby letters of credit.
Other Current and Non-Current Liabilities [Table Text Block] |
Other Current Liabilities |  |  |
As of December 31 | 2015 |  |  | 2014 |
Millions |  |  |
Customer Deposits |  | $15.1 |  |  |  | $19.7 |
Power Purchase Agreements (a) | 23.3 |  |  | 19.4 |
Construction Deposits Received for Development Project (b) | — |  |  | 54.3 |
Other (c) | 47.7 |  |  | 27.4 |
Total Other Current Liabilities |  | $86.1 |  |  |  | $120.8 |
(a) | Power Purchase Agreements acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisitions. (See Note 7. Acquisitions.)
(b) | Construction Deposits Received for Development Project relate to ALLETE Clean Energy’s project to construct a wind energy facility which was sold in 2015. (See Note 7. Acquisitions.)
(c) | Increase in 2015 includes customer refund liabilities of approximately $7 million, pending regulatory approval.
Other Non-Current Liabilities |  |  |
As of December 31 | 2015 |  |  | 2014 |
Millions |  |  |
Asset Retirement Obligation |  | $131.4 |  |  |  | $109.2 |
Power Purchase Agreements (a) | 138.1 |  |  | 110.7 |
Contingent Consideration (b) | 36.6 |  |  | — |
Other | 42.9 |  |  | 45.1 |
Total Other Non-Current Liabilities |  | $349.0 |  |  |  | $265.0 |
(a) | Power Purchase Agreements acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisitions. (See Note 7. Acquisitions.)
(b) | Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 7. Acquisitions and Note 10. Fair Value.)

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