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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities |  | $ 1,136.8 | $ 1,317.0
Letters of credit in support of reclamation obligations or activities |  | 188.5 | 142.3
Successor |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Balance at beginning of period |  |  | 691.1
Liabilities incurred or acquired |  | 0.0 | 16.3
Liabilities settled or disposed |  | (65.2) | (57.8)
Accretion expense |  | 32.6 | 48.5
Revisions to estimates |  | 59.5 | 52.1
Balance at end of period |  | 691.1 |
Less: Current portion (included in “Accounts payable and accrued expenses”) |  | 34.1 | 63.8
Noncurrent obligation (included in “Asset retirement obligations”) |  | 657.0 | 686.4
Balance at end of period — active locations |  | 612.9 | 671.8
Balance at end of period — closed or inactive locations |  | 78.2 | 78.4
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities |  |  | $ 1,589.8
Cash collateral in support of reclamation obligations or activities |  | $ 205.2 |
Successor | LOM 3 Years or Less |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Credit adjusted risk free interest rates |  | 7.61% |
Successor | LOM Greater than 20 Years |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Credit adjusted risk free interest rates |  | 11.54% |
Predecessor |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Balance at beginning of period | $ 758.8 | $ 664.2 |
Liabilities incurred or acquired | 0.0 |  |
Liabilities settled or disposed | (2.7) |  |
Accretion expense | 12.5 |  |
Revisions to estimates | (104.4) |  |
Balance at end of period | 664.2 |  |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 31.1 |  |
Noncurrent obligation (included in “Asset retirement obligations”) | 633.1 |  |
Balance at end of period — active locations | 540.1 |  |
Balance at end of period — closed or inactive locations | $ 124.1 |  |

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- Definition Letters of credit in support of reclamation obligations or activities + References No definition available. + Details
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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 asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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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