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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Apr. 01, 2017 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | $ 1,136.8 |  |  | $ 1,136.8 | $ 374.3 |
Amount of reclamation self-bonding in certain states in which the company qualifies |  |  |  |  | 1,094.2 |
Letters of credit in support of reclamation obligations or activities | 188.5 |  |  | 188.5 | 80.0 |
Predecessor |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Total asset retirement obligation |  | $ 664.2 |  |  | 758.8 | $ 712.1
Current portion |  | 31.1 |  |  | 41.0 |
Liabilities settled or disposed |  | (2.7) |  |  | (41.5) |
Accretion expense |  | 12.5 |  |  | 45.7 |
Revision to estimates |  | (104.4) |  |  | 42.5 |
Noncurrent obligation |  | 633.1 |  |  | 717.8 |
Balance at end of period — active locations |  | 540.1 |  |  | 634.8 |
Balance at end of period — closed or inactive locations |  | 124.1 |  |  | 124.0 |
Net gain on disposal of assets |  | $ (22.8) | $ (13.7) |  | (23.2) | $ (45.0)
Credit adjusted, risk-free interest rates |  |  |  |  |  | 50.83%
Cash collateral in support of reclamation obligations or activities |  |  |  |  | $ 233.2 |
Predecessor | U.S. Obligations [Member] |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Credit adjusted, risk-free interest rates |  | 9.36% |  |  | 13.45% |
Predecessor | Australian Operations [Member] |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Credit adjusted, risk-free interest rates |  | 4.36% |  |  | 4.92% |
Successor |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Total asset retirement obligation | 691.1 | $ 664.2 |  | 691.1 |  |
Current portion | 34.1 |  |  | 34.1 |  |
Liabilities settled or disposed |  |  |  | (65.2) |  |
Accretion expense |  |  |  | 32.6 |  |
Revision to estimates |  |  |  | 59.5 |  |
Noncurrent obligation | 657.0 |  |  | 657.0 |  |
Balance at end of period — active locations | 612.9 |  |  | 612.9 |  |
Balance at end of period — closed or inactive locations | 78.2 |  |  | 78.2 |  |
Net gain on disposal of assets | (83.1) |  |  | (84.0) |  |
Cash collateral in support of reclamation obligations or activities | $ 205.2 |  |  | $ 205.2 |  |
Successor | U.S. Obligations [Member] |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Credit adjusted, risk-free interest rates | 9.71% |  |  | 9.71% |  |
Successor | Australian Operations [Member] |  |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |
Credit adjusted, risk-free interest rates | 4.65% |  |  | 4.65% |  |

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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