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Financial Instruments and Other Guarantees - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Apr. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017 | Apr. 03, 2017
Successor |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Surety Bonds outstanding | $ 1,637.3 |  |  |  | $ 1,637.3 |  |
Letters of credit outstanding, amount | 252.2 |  |  |  | 252.2 |  |
Asset retirement obligations | 670.7 |  |  |  | 670.7 | $ 657.0 |
Interest expense | 38.2 | $ 42.4 |  | $ 83.8 | 112.8 |  |
Collateral arrangements | 0.0 |  |  |  | 0.0 | 323.1 |
Net impact on collateral requirements |  |  |  | 81.2 | 323.1 |  |
Restricted cash |  |  |  |  |  | $ 40.1 |
Provision for North Goonyella equipment loss | 49.3 | $ 0.0 |  | 0.0 | 49.3 |  |
Successor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount | 0.0 |  |  |  | 0.0 |  |
Letters of credit drawn on, amount | 146.3 |  |  |  | 146.3 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 250.0
Cash collateral required | 0.0 |  |  |  | 0.0 |  |
Interest expense | 1.7 |  |  | $ 3.9 | 5.5 |  |
Successor | U.S Mining |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Surety Bonds outstanding | 1,370.9 |  |  |  | 1,370.9 |  |
Letters of credit outstanding, amount | 152.7 |  |  |  | 152.7 |  |
Asset retirement obligations | 703.0 |  |  |  | $ 703.0 |  |
Predecessor |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Interest expense |  |  | $ 32.9 |  |  |  |
Net impact on collateral requirements |  |  | (66.4) |  |  |  |
Provision for North Goonyella equipment loss |  |  | 0.0 |  |  |  |
Predecessor | Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Interest expense |  |  | $ 2.0 |  |  |  |
Leased Equipment | Successor |  |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |  |
Provision for North Goonyella equipment loss | $ 40.2 |  |  |  |  |  |

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