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Investments | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Equity Method Investments Equity Method Investments The Company’s equity method investments include its joint venture interest in Middlemount and certain other equity method investments. 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 from equity affiliates”:
|  |  | Successor | Predecessor
| Book Value at |  | (Income) Loss from Equity Affiliates
| December 31, 2019 |  | December 31, 2018 |  | Year Ended December 31, 2019 |  | Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017
| (Dollars in millions)
Equity method investment and financing receivables related to Middlemount | $ | 56.3 |  |  | $ | 45.0 |  |  | $ | (9.0 | ) |  | $ | (69.3 | ) |  | $ | (48.6 | ) | $ | (17.4 | )
Other equity method investments | 0.6 |  |  | 0.9 |  |  | 5.6 |  |  | 1.2 |  |  | (0.4 | ) | 2.4 |
Total equity method investments and financing receivables related to Middlemount | $ | 56.9 |  |  | $ | 45.9 |  |  | $ | (3.4 | ) |  | $ | (68.1 | ) |  | $ | (49.0 | ) | $ | (15.0 | )
As of December 31, 2019 and 2018, respectively, the financing receivables are accounted for as in-substance common stock due to the limited fair value attributed to Middlemount’s equity. The Company received cash payments from Middlemount of $14.7 million, $106.7 million, $48.1 million and $32.7 million during the years ended December 31, 2019 and 2018, the period April 2 through December 31, 2017 and the period January 1 through April 1, 2017, respectively. One of the Company’s Australian subsidiaries and the other shareholder of Middlemount are parties to an agreement, as amended from time to time, to provide a revolving loan (Revolving Loans) to Middlemount. The Company’s participation in the Revolving Loans will not, at any time, exceed its 50% equity interest of the revolving loan limit, which was $50 million Australian dollars and fully drawn upon by Middlemount at December 31, 2019. Subsequent to December 31, 2019, the parties amended the agreement to temporarily increase the revolving loan limit to $70 million Australian dollars through August 2020, at which time the revolving loan limit will revert to $50 million Australian dollars. The Revolving Loans bear interest at 15% per annum and expire on December 31, 2020. The carrying value of the Revolving Loans due to the Company’s Australian subsidiary was $17.1 million and zero as of December 31, 2019 and 2018, respectively. During the year ended December 31, 2018 the Company determined that a valuation allowance on Middlemount’s net deferred tax position was no longer necessary based on recent cumulative earnings and expectation of future earnings. The determination resulted in approximately $9 million of income which was more than offset by a tax reserve of approximately $17 million due to an uncertain tax position relating to an ongoing income tax audit of Middlemount. During the year ended December 31, 2019, Middlemount received notification that the Australian Taxation Office would no longer pursue its position, and the related tax reserve was released. During the years ended December 31, 2019 and 2018, the period April 2 through December 31, 2017, and the period January 1 through April 1, 2017, respectively, Middlemount generated revenues of approximately $160 million, $271 million, $193 million and $60 million (on a 50% basis). Middlemount had current assets, noncurrent assets, current liabilities and noncurrent liabilities of $30.8 million, $209.7 million, $225.8 million and $40.1 million, respectively, as of December 31, 2019 and $33.6 million, $181.8 million, $187.9 million and $35.8 million, respectively, as of December 31, 2018 (on a 50% basis).

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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