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Financial Instruments and Other Guarantees Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 03, 2017
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities |  |  |  |  | $ 1,136.8 | $ 374.3 |  |
U.S. Mining |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligations |  |  |  |  | 457.9 |  |  |
Reclamation Bonding Surety Bond | U.S. Mining | Surety Bond |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 1,075.2 |  |  |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Cash collateral required |  |  |  |  | 0.0 |  |  |
Successor |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligations |  |  | $ 664.2 |  | 691.1 |  |  |
Cash collateral in support of reclamation obligations or activities |  |  |  |  | 205.2 |  |  |
Interest expense | $ 42.5 | $ 41.4 |  |  | 119.7 |  |  |
Successor | Obligations [Member] |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Restricted cash collateral |  |  |  |  | 323.1 |  |  |
Successor | U.S. Mining |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | 174.0 |  |  |
Successor | Australian Mining |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligations |  |  |  |  | 233.2 |  |  |
Cash collateral in support of reclamation obligations or activities |  |  |  |  | 205.2 |  |  |
Surety bonds and bank guarantees outstanding to secure reclamation obligations or activities |  |  |  |  | 61.6 |  |  |
Letters of credit outstanding, amount |  |  |  |  | 14.5 |  |  |
Successor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 0.0 |  |  |
Exit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 250.0
Letters of credit outstanding, amount |  |  |  |  | 169.5 |  |  |
Interest expense |  |  |  |  | 5.3 |  |  |
Successor | Obligations [Member] |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Restricted cash collateral |  |  |  |  | $ 40.1 |  |  |
Predecessor |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligations |  |  | 664.2 |  |  | 758.8 | $ 712.1 |
Cash collateral in support of reclamation obligations or activities |  |  |  |  |  | 233.2 |  |
Interest expense |  |  | 32.9 | $ 126.2 |  | 298.6 | 465.4 |
Predecessor | Obligations [Member] |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Restricted cash collateral |  |  |  |  |  | 529.3 |  |
Predecessor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  | $ 2.0 |  |  | 8.2 | $ 1.8 |
Predecessor | Secured Debt | Former Securitization Facility |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Cash collateral required |  |  |  |  |  | 40.5 |  |
Predecessor | Obligations [Member] |  |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |  |
Restricted cash collateral |  |  |  |  |  | $ 13.8 |  |

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