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Operations and Significant Accounting Policies (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Cash, Cash Equivalents and Restricted Cash [Abstract] |  |  |  |  |
Cash and Cash Equivalents |  | $ 121.9 | $ 98.9 | $ 84.2 | $ 27.5
Restricted Cash included in Prepayments and Other |  | 2.3 | 2.6 | 3.7 | 2.2
Restricted Cash included in Other Non-Current Assets |  | 8.6 | 8.6 | 8.6 | 8.6
Total Cash, Cash Equivalents and Restricted Cash |  | 132.8 | 110.1 | $ 96.5 | $ 38.3
Inventories – Net [Abstract] |  |  |  |  |
Fuel | [1] | 31.4 | 34.8 |  |
Materials and Supplies |  | 44.3 | 46.5 |  |
Construction of Wind Energy Facility | [2] | 54.1 | 0.0 |  |
Raw Materials |  | 3.0 | 2.8 |  |
Work in Progress |  | 4.4 | 4.2 |  |
Finished Goods |  | 9.1 | 8.3 |  |
Reserve for Obsolescence |  | (0.9) | (0.7) |  |
Total Inventories – Net |  | 145.4 | 95.9 |  |
Other Non-Current Assets [Abstract] |  |  |  |  |
Contract Assets | [3] | 30.9 | 31.6 |  |
Finance Receivable |  | 10.9 | 11.0 |  |
Other |  | 63.2 | 65.1 |  |
Total Other Non-Current Assets |  | 105.0 | 107.7 |  |
Other Current Liabilites [Abstract] |  |  |  |  |
Provision for Interim Rate Refund | [4] | 32.5 | 0.0 |  |
Contract Liabilities | [5] | 24.3 | 8.7 |  |
PSAs |  | 18.4 | 24.5 |  |
Provision for Tax Reform Refunds | [6] | 6.7 | 0.0 |  |
Contingent Consideration - Current | [7] | 5.6 | 0.0 |  |
Other |  | 41.0 | 50.0 |  |
Total Other Current Liabilities |  | 128.5 | 83.2 |  |
Other Non-Current Liabilities [Abstract] |  |  |  |  |
Asset Retirement Obligation |  | 143.2 | 122.7 |  |
PSAs |  | 83.1 | 89.5 |  |
Contingent Consideration - Non-current | [8] | 0.0 | 5.4 |  |
Other |  | 48.1 | 49.5 |  |
Total Other Non-Current Liabilities |  | $ 274.4 | $ 267.1 |  |
[1] | Fuel consists primarily of coal inventory at Minnesota Power.
[2] | On February 28, 2018, Montana-Dakota Utilities exercised its option to purchase the Thunder Spirit II wind energy facility upon completion, resulting in a reclassification of the project costs from Property, Plant and Equipment – Net to Inventories – Net as ALLETE Clean Energy will not own the facility upon completion.
[3] | Contract Assets include 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.
[4] | Provision for Interim Rate Refund is expected to be refunded to Minnesota Power’s regulated retail customers in the first quarter of 2019 and includes $16.7 million of discounts provided to EITE customers that will be offset against interim rate refunds as of June 30, 2018 ($8.6 million as of December 31, 2017). (See Note 6. Regulatory Matters.)
[5] | Contract Liabilities include deposits received as a result of entering into contracts with our customers prior to completing our performance obligations.
[6] | Provision for Tax Reform Refund is deferred as a regulatory liability pending the outcome of regulatory proceedings with the MPUC and PSCW. (See Note 6. Regulatory Matters.)
[7] | 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.)
[8] | 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.)

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