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Operations and Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2015
Operations and Significant Accounting Policies [Abstract] |
Inventories [Table Text Block] |
Inventories | March 31, 2015 |  |  | December 31, 2014 |
Millions |  |  |
Regulated Operations Inventories |  |  |
Fuel |  | $38.0 |  |  |  | $29.0 |
Materials and Supplies | 34.6 |  |  | 35.2 |
Total Regulated Operations Inventories | 72.6 |  |  | 64.2 |
Investments and Other Inventories (a) |  |  |
Materials and Supplies | 16.3 |  |  | 16.3 |
Raw Materials | 3.1 |  |  | — |
Work in Progress | 1.0 |  |  | — |
Finished Goods | 10.2 |  |  | — |
Reserve for Obsolescence | (0.5 | ) |  | — |
Total Investments and Other Inventories | 30.1 |  |  | 16.3 |
Total Inventories |  | $102.7 |  |  |  | $80.5 |
(a) | Raw materials, Work in Progress, Finished Goods, and Reserve for Obsolescence presented are attributable to U.S. Water Services which was acquired February 10, 2015.
Prepayments and Other Current Assets [Table Text Block] |
Prepayments and Other Current Assets | March 31, 2015 |  |  | December 31, 2014 |
Millions |  |  |
Deferred Fuel Adjustment Clause |  | $15.6 |  |  |  | $16.3 |
Construction Costs for Development Project (a) | 48.4 |  |  | 48.2 |
Restricted Cash (b) | 5.6 |  |  | 2.7 |
Other | 18.9 |  |  | 14.8 |
Total Prepayments and Other Current Assets |  | $88.5 |  |  |  | $82.0 |
(a) | Construction Costs for Development Project relate to ALLETE Clean Energy’s acquisition in November 2014 of a project to develop and construct a wind energy facility in 2015. (See Other Current Liabilities table and Note 4. Acquisitions.)
(b) | Restricted Cash related to ALLETE Clean Energy’s wind energy facilities operating expense and capital distribution reserve requirements and cash pledged as collateral by U.S. Water Services for stand-by letters of credit.
Other Current and Non-Current Liabilities [Table Text Block] |
Other Current Liabilities | March 31, 2015 |  |  | December 31, 2014 |
Millions |  |  |
Customer Deposits |  | $20.0 |  |  |  | $19.7 |
Power Purchase Agreements (a) | 18.9 |  |  | 19.4 |
Construction Deposits Received for Development Project (b) | 54.3 |  |  | 54.3 |
Other | 25.4 |  |  | 27.4 |
Total Other Current Liabilities |  | $118.6 |  |  |  | $120.8 |
(a) | Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisitions in 2014. (See Note 4. Acquisitions.)
(b) | Construction Deposits Received for Development Project relate to ALLETE Clean Energy’s project to develop and construct a wind energy facility in 2015. (See Prepayments and Other Current Assets table and Note 4. Acquisitions.)
Other Non-Current Liabilities | March 31, 2015 |  |  | December 31, 2014 |
Millions |  |  |
Asset Retirement Obligation |  | $111.6 |  |  |  | $109.2 |
Power Purchase Agreements (a) | 106.3 |  |  | 110.7 |
Contingent Consideration (b) | 35.8 |  |  | — |
Other | 48.6 |  |  | 45.1 |
Total Other Non-Current Liabilities |  | $302.3 |  |  |  | $265.0 |
(a) | Power Purchase Agreements were acquired in conjunction with the ALLETE Clean Energy wind energy facilities acquisitions in 2014. (See Note 4. Acquisitions.)
(b) | Contingent Consideration relates to the estimated fair value of the earnings-based payment to acquire the remaining ownership interest in U.S. Water Services. (See Note 4. Acquisitions and Note 7. Fair Value.)
Supplemental Statement of Cash Flows Information [Table Text Block] | Supplemental Statement of Cash Flows Information.
Three Months Ended March 31, | 2015 |  |  | 2014 |
Millions |  |  |
Cash Paid During the Period for Interest – Net of Amounts Capitalized |  | $15.3 |  |  |  | $12.4 |
Cash Paid During the Period for Income Taxes |  | $0.1 |  |  |  | $0.2 |
Noncash Investing and Financing Activities |  |  |  |  |
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment | $(32.2) |  | $(22.6)
Capitalized Asset Retirement Costs | $1.2 |  |  | $0.6 |
AFUDC–Equity |  | $0.9 |  |  |  | $1.8 |
ALLETE Common Stock Contributed to the Pension Plan | — |  |  |  | $19.5 |
Contingent Consideration |  | $35.7 |  |  | — |

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