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Financial Instruments and Other Guarantees Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016 | Apr. 03, 2017
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | $ 1,317.0 |  |  |  |  |  |  | $ 1,136.8 | $ 1,317.0 |  |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash collateral required | 0.0 |  |  |  |  |  |  |  | 0.0 |  |
Successor |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligations |  |  |  |  |  |  |  | 691.1 |  |  |
Cash collateral in support of reclamation obligations or activities |  |  |  |  |  |  |  | 205.2 |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | 1,589.8 |  |  |  |  |  |  |  | 1,589.8 |  |
Letters of credit outstanding, amount | 245.0 |  |  |  |  |  |  |  | 245.0 |  |
Interest expense | 36.5 | $ 38.2 | $ 38.3 | $ 36.3 | $ 42.5 | $ 41.4 |  | 119.7 | 149.3 |  |
Provision for North Goonyella equipment loss | 17.1 | $ 49.3 |  |  |  |  |  | 0.0 | 66.4 |  |
Successor | Obligations |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash collateral | 0.0 |  |  |  |  |  |  | 323.1 | 0.0 |  |
Successor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 0.0 |  |  |  |  |  |  |  | 0.0 |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 250.0
Letters of credit outstanding, amount | 137.1 |  |  |  |  |  |  |  | 137.1 |  |
Interest expense |  |  |  |  |  |  |  | 5.3 | 5.2 |  |
Successor | Obligations |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted cash collateral | 0.0 |  |  |  |  |  |  | $ 40.1 | 0.0 |  |
Successor | U.S Mining |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligations | 750.2 |  |  |  |  |  |  |  | 750.2 |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities | 1,317.0 |  |  |  |  |  |  |  | 1,317.0 |  |
Letters of credit outstanding, amount | $ 147.3 |  |  |  |  |  |  |  | $ 147.3 |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligations |  |  |  |  |  |  | $ 664.2 |  |  | $ 758.8 |
Interest expense |  |  |  |  |  |  | 32.9 |  |  | 298.6 |
Provision for North Goonyella equipment loss |  |  |  |  |  |  | 0.0 |  |  | 0.0 |
Predecessor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 2.0 |  |  | $ 8.2 |

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