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Asset Impairment (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 | Apr. 01, 2017 | Jun. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Asset Impairment |  |  |  |  |  |  |
Asset impairment |  |  |  |  | $ 247.9 | $ 1,277.8 | $ 154.4
Predecessor |  |  |  |  |  |  |
Asset Impairment |  |  |  |  |  |  |
Asset impairment | $ 0.0 | $ 30.5 | $ 0.0 | $ 17.2 |  |  |
Terminated Coal Lease Contracts | Predecessor |  |  |  |  |  |  |
Asset Impairment |  |  |  |  |  |  |
Asset impairment |  | $ 30.5 |  |  |  |  |
Queensland, Australia | Predecessor |  |  |  |  |  |  |
Asset Impairment |  |  |  |  |  |  |
Write down of certain targeted divestiture assets |  |  |  | $ 17.2 |  |  |

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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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