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Other Events (Details) $ in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 AUD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Feb. 06, 2018
Successor |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  | $ 23.0 |  |
Net gain on disposal of assets |  | 30.6 |  |
Asset Impairment Charges |  | 0.0 |  |
Successor | Contract Termination [Member] |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Asset Impairment Charges |  | 0.0 |  |
Successor | Red Mountain Joint Venture |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  | 20.0 |  |
Net gain on disposal of assets |  | 7.1 |  |
Successor | Queensland’s Bowen Basin [Member] |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Proceeds from disposal of assets, net of notes receivable | $ 37.0 |  |  |
Net gain on disposal of assets |  | $ 20.6 |  |
Successor | DTA and PBGC |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Equity method investment, ownership percentage |  |  |  | 50.00%
Predecessor |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  | $ 24.3 |
Net gain on disposal of assets |  |  | 22.8 |
Asset Impairment Charges |  |  | 30.5 |
Predecessor | Contract Termination [Member] |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Asset Impairment Charges |  |  | $ 30.5 |
Predecessor | DTA and PBGC |  |  |  |
Other Commercial Events [Line Items] |  |  |  |
Equity method investment, ownership percentage |  |  | 37.50% |
Proceeds from disposal of assets, net of notes receivable |  |  | $ 20.5 |
Net gain on disposal of assets |  |  | $ 19.7 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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