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Operations and Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Inventories – Net [Table Text Block] |
Inventories – Net | September 30, 2017 |  |  | December 31, 2016 |
Millions |  |  |
Fuel (a) |  | $39.6 |  |  |  | $43.9 |
Materials and Supplies | 48.2 |  |  | 48.7 |
Raw Materials | 2.9 |  |  | 2.9 |
Work in Progress | 3.5 |  |  | 1.0 |
Finished Goods | 9.4 |  |  | 8.6 |
Reserve for Obsolescence | (1.0 | ) |  | (0.9 | )
Total Inventories – Net |  | $102.6 |  |  |  | $104.2 |
(a) | Fuel consists primarily of coal inventory at Minnesota Power.
Prepayments and Other Current Assets [Table Text Block] |
Prepayments and Other Current Assets | September 30, 2017 |  |  | December 31, 2016 |
Millions |  |  |
Deferred Fuel Adjustment Clause |  | $20.2 |  |  |  | $18.6 |
Restricted Cash | 6.5 |  |  | 2.2 |
Other | 17.5 |  |  | 19.5 |
Total Prepayments and Other Current Assets |  | $44.2 |  |  |  | $40.3 |
Other Non-Current Assets [Table Text Block] |
Other Non-Current Assets | September 30, 2017 |  |  | December 31, 2016 |
Millions |  |  |
Contract Payment |  | $28.0 |  |  |  | $29.6 |
Finance Receivable | 11.0 |  |  | 11.5 |
Restricted Cash | 8.6 |  |  | 8.6 |
Other | 55.4 |  |  | 56.8 |
Total Other Non-Current Assets |  | $103.0 |  |  |  | $106.5 |
Other Current Liabilities [Table Text Block] |
Other Current Liabilities | September 30, 2017 |  |  | December 31, 2016 |
Millions |  |  |
PSAs |  | $24.8 |  |  |  | $24.6 |
Other | 59.9 |  |  | 49.1 |
Total Other Current Liabilities |  | $84.7 |  |  |  | $73.7 |
Other Non-Current Liabilities [Table Text Block] |
Other Non-Current Liabilities | September 30, 2017 |  |  | December 31, 2016 |
Millions |  |  |
Asset Retirement Obligation |  | $157.4 |  |  |  | $136.6 |
PSAs | 95.3 |  |  | 113.8 |
Contingent Consideration (a) | 5.6 |  |  | 25.0 |
Other | 42.8 |  |  | 47.3 |
Total Other Non-Current Liabilities |  | $301.1 |  |  |  | $322.7 |
(a) | Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 5. Fair Value.)
Supplemental Statement of Cash Flows Information [Table Text Block] | Supplemental Statement of Cash Flows Information.
Nine Months Ended September 30, | 2017 |  |  | 2016 |
Millions |  |  |
Cash Paid During the Period for Interest – Net of Amounts Capitalized |  | $51.4 |  |  |  | $54.9 |
Cash Paid During the Period for Income Taxes |  | $0.4 |  |  |  | $0.5 |
Noncash Investing and Financing Activities |  |  |  |  |
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment | $1.2 |  | $(19.5)
Capitalized Asset Retirement Costs |  | $19.7 |  |  |  | $3.7 |
AFUDC–Equity |  | $0.7 |  |  |  | $1.7 |
ALLETE Common Stock Contributed to the Pension Plans |  | $13.5 |  |  | — |
ALLETE Common Stock Received for Land Inventory | — |  |  |  | $8.0 |
Long-Term Finance Receivable for Land Inventory | — |  |  |  | $12.0 |

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