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Investments Textuals (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Successor |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in tax reserves |  | $ 7,200,000 | $ 2,100,000 |
Equity method investment |  | 0 | $ 0 |
Successor | Middlemount Mine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment |  |  | 50.00% |
Successor | Financing Receivable | Middlemount Mine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Financing Receivable, Cash received from Equity Interest |  | 48,100,000 | $ 106,700,000 |
Successor | Equity method investment and financing receivables related to Middlemount |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment |  |  | 50.00% |
Successor | Middlemount Mine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Summarized Financial Information, Revenue |  | 193,000,000 | $ 271,000,000 |
Changes in tax reserves |  |  | 17,000,000 |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) |  |  | 9,000,000 |
Predecessor |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in tax reserves | $ (9,200,000) |  |  | $ 2,300,000
Equity method investment | 0 |  |  | 0
Predecessor | Financing Receivable | Middlemount Mine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Financing Receivable, Cash received from Equity Interest | 32,700,000 |  |  |
Predecessor | Middlemount Mine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Method Investment, Summarized Financial Information, Current Assets |  | 61,700,000 | 33,600,000 |
Equity Method Investment, Summarized Financial Information, Revenue | $ 60,000,000 |  |  | $ 183,000,000
Equity Method Investment, Summarized Financial Information, Noncurrent Assets |  | 232,200,000 | 181,800,000 |
Equity Method Investment, Summarized Financial Information, Current Liabilities |  | 313,900,000 | 187,900,000 |
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities |  | $ 41,200,000 | $ 35,800,000 |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=99375318&loc=d3e32787-111569 + Details
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