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Financial Instruments and Other Guarantees - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Apr. 03, 2017
Successor |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Asset retirement obligations | $ 665.9 |  | $ 657.0 |
Letters of credit outstanding, amount | 0.0 |  |  |
Interest expense | 36.3 |  |  |
Collateral arrangements - current | 109.1 |  | 0.0 |
Collateral arrangements | 0.0 |  | 323.1 |
Net impact on collateral requirements | 214.0 |  |  |
Restricted cash |  |  | $ 40.1 |
Successor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit drawn on, amount | 176.3 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 250.0
Cash collateral required | 0.0 |  |  |
Interest expense | 1.3 |  |  |
Successor | U.S Mining |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Asset retirement obligations | 469.0 |  |  |
Surety Bonds outstanding for reclamation | 1,074.3 |  |  |
Letters of credit outstanding, amount | 174.1 |  |  |
Successor | Australian Mining |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Asset retirement obligations | 230.2 |  |  |
Surety Bonds outstanding for reclamation | 270.1 |  |  |
Letters of credit outstanding, amount | 14.4 |  |  |
Cash collateral in support of reclamation obligations or activities | $ 99.7 |  |  |
Predecessor |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Interest expense |  | $ 32.9 |  |
Net impact on collateral requirements |  | (66.4) |  |
Predecessor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Interest expense |  | $ 2.0 |  |

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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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