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Operations and Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Cash, Cash Equivalents and Restricted Cash [Table Text Block] | The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheet that aggregate to the amounts presented in the Consolidated Statement of Cash Flows.
Cash, Cash Equivalents and Restricted Cash | June 30, 2020 |  | December 31, 2019 |  | June 30, 2019 |  | December 31, 2018
Millions |  |  |  |  |  |  |
Cash and Cash Equivalents | $25.7 |  |  | $69.3 |  |  | $203.1 |  |  | $69.1 |
Restricted Cash included in Prepayments and Other | 7.3 |  |  | 2.8 |  |  | 0.9 |  |  | 1.3 |
Restricted Cash included in Other Non-Current Assets | 4.4 |  |  | 20.4 |  |  | 2.6 |  |  | 8.6 |
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows | $37.4 |  |  | $92.5 |  |  | $206.6 |  |  | $79.0 |
Inventories – Net [Table Text Block] |
Inventories – Net | June 30, 2020 |  | December 31, 2019
Millions |  |  |
Fuel (a) | $33.5 |  |  | $25.9 |
Materials and Supplies | 48.5 |  |  | 46.9 |
Total Inventories – Net | $82.0 |  |  | $72.8 |
(a) Fuel consists primarily of coal inventory at Minnesota Power. NOTE 1. OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Continued)
Other Non-Current Assets [Table Text Block] |
Other Non-Current Assets | June 30, 2020 |  | December 31, 2019
Millions |  |  |
Contract Assets (a) | $26.7 |  |  | $28.0 |
Operating Lease Right-of-use Assets | 25.4 |  |  | 28.6 |
ALLETE Properties | 21.5 |  |  | 21.9 |
Restricted Cash | 4.4 |  |  | 20.4 |
Other Postretirement Benefit Plans | 38.4 |  |  | 37.5 |
Other | 84.7 |  |  | 81.8 |
Total Other Non-Current Assets | $201.1 |  |  | $218.2 |
(a) Contract Assets consist of payments made to customers as an incentive to execute or extend service agreements. The contract payments are being amortized over the term of the respective agreements as a reduction to revenue.
Other Current Liabilities [Table Text Block] |
Other Current Liabilities | June 30, 2020 |  | December 31, 2019
Millions |  |  |
PSAs | $12.4 |  |  | $12.3 |
Provision for Interim Rate Refund (a) | 11.7 |  |  | — |
Operating Lease Liabilities | 6.6 |  |  | 6.9 |
Other | 34.7 |  |  | 41.2 |
Total Other Current Liabilities | $65.4 |  |  | $60.4 |
(a)Provision for Interim Rate Refund represents reserves for interim rates resulting from the MPUC’s approval of Minnesota Power’s petition and proposal to resolve and withdraw its rate case. (See Note 2. Regulatory Matters.)
Other Non-Current Liabilities [Table Text Block] |
Other Non-Current Liabilities | June 30, 2020 |  | December 31, 2019
Millions |  |  |
Asset Retirement Obligation | $164.8 |  |  | $160.3 |
PSAs | 58.3 |  |  | 64.6 |
Operating Lease Liabilities | 18.8 |  |  | 21.8 |
Other | 46.2 |  |  | 46.3 |
Total Other Non-Current Liabilities | $288.1 |  |  | $293.0 |
Other Income [Table Text Block] |
Other Income |  |
Six Months Ended June 30, | 2020 | 2019
Millions |  |
Pension and Other Postretirement Benefit Plan Non-Service Credits (a) | $4.8 |  | $3.6 |
Interest and Investment Income (Loss) | (0.5) |  | 2.5 |
AFUDC - Equity | 1.4 |  | 1.3 |
Gain on Land Sales | 0.1 |  | 2.0 |
Other | 0.4 |  | 2.2 |
Total Other Income | $6.2 |  | $11.6 |
(a)These are components of net periodic pension and other postretirement benefit cost other than service cost. (See Note 9. Pension and Other Postretirement Benefit Plans.)
Supplemental Statement of Cash Flows Information [Table Text Block] | Supplemental Statement of Cash Flows Information.
Six Months Ended June 30, | 2020 |  | 2019
Millions |  |  |
Cash Paid for Interest – Net of Amounts Capitalized | $30.9 |  |  | $33.8 |
Recognition of Right-of-use Assets and Lease Liabilities | — |  |  | $31.2 |
Noncash Investing and Financing Activities |  |  |
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment | $(67.5) |  | $21.1 |
Capitalized Asset Retirement Costs | $2.1 |  |  | $1.4 |
AFUDC–Equity | $1.4 |  |  | $1.3 |

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