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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Equity Method Investments [Table Text Block] | The table below summarizes the book value of those investments and related financing receivables, which are reported in “Investments and other assets” in the consolidated balance sheets, and the related “(Income) loss from equity affiliates”:
| Successor | Predecessor |  | Successor | Predecessor
| Book Value at |  | (Income) Loss from Equity Affiliates
| December 31, 2017 | December 31, 2016 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016 |  | Year Ended December 31, 2015
| (Dollars in millions)
Equity method investment and financing receivables related to Middlemount | $ | 82.1 |  | $ | 84.8 |  |  | $ | (48.6 | ) | $ | (17.4 | ) |  | $ | (22.6 | ) |  | $ | 7.0 |
Other equity method investments | 1.7 |  | 0.5 |  |  | (0.4 | ) | 2.4 |  |  | 6.4 |  |  | 8.9 |
Total equity method investments and financing receivables related to Middlemount | $ | 83.8 |  | $ | 85.3 |  |  | $ | (49.0 | ) | $ | (15.0 | ) |  | $ | (16.2 | ) |  | $ | 15.9 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- References No definition available. + Details
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