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Other Events (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2016 | Nov. 30, 2015 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2016
DTA and PBGC |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Proceeds from disposal of assets, net of notes receivable |  |  |  |  | $ 20.5 |
Net gain on disposal of assets |  |  |  | $ 19.7 |  |
Metropolitan Collieries Pty Ltd |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Planned divestiture, agreed upon proceeds from divestiture | $ 200.0 |  |  |  |  |
Dominion Terminal Associates Partnership |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 37.50%
Bowie Resource Partners, LLC | New Mexico and Colorado Assets |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Planned divestiture, agreed upon proceeds from divestiture |  | $ 358.0 |  |  |  |
Termination fee |  |  | $ 20.0 |  |  |

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- Definition Planned Divestiture, Agreed Upon Proceeds from Divestiture + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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