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Equity Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |
ALLETE's Investment in ATC [Table Text Block] |
ALLETE’s Investment in ATC |  |
Year Ended December 31 | 2018 |  | 2017 |
Millions |  |
Equity Investment Beginning Balance |  | $118.7 |  |  | $135.6 |
Cash Investments | 6.2 |  | 7.8 |
Equity in ATC Earnings | 17.5 |  | 22.5 |
Distributed ATC Earnings | (15.2 | ) | (19.3 | )
Remeasurement of Deferred Income Taxes (a) | — |  | (27.9 | )
Amortization of the Remeasurement of Deferred Income Taxes | 0.9 |  | — |
Equity Investment Ending Balance |  | $128.1 |  |  | $118.7 |
(a) | Impact of the remeasurement of deferred income tax assets and liabilities resulting from the TCJA.
ATC Summarized Financial Data |  |
Balance Sheet Data |  |
As of December 31 | 2018 |  | 2017 |
Millions |  |
Current Assets |  | $87.2 |  |  | $87.7 |
Non-Current Assets | 4,928.8 |  | 4,598.9 |
Total Assets |  | $5,016.0 |  |  | $4,686.6 |
Current Liabilities |  | $640.0 |  |  | $767.2 |
Long-Term Debt | 2,014.0 |  | 1,790.6 |
Other Non-Current Liabilities | 295.3 |  | 240.3 |
Members’ Equity | 2,066.7 |  | 1,888.5 |
Total Liabilities and Members’ Equity |  | $5,016.0 |  |  | $4,686.6 |
Income Statement Data |  |  |
Year Ended December 31 | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Revenue |  | $690.5 |  |  | $721.6 |  |  | $650.8 |
Operating Expense | 358.7 |  | 344.9 |  | 322.5 |
Other Expense | 108.3 |  | 104.1 |  | 95.5 |
Net Income |  | $223.5 |  |  | $272.6 |  |  | $232.8 |
ALLETE’s Equity in Net Income |  | $17.5 |  |  | $22.5 |  |  | $18.5 |

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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