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Financial Instruments and Other Guarantees - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Guarantee Obligations [Line Items] |  |  |  |  |  |
Surety Bonds outstanding | $ 1,589.4 |  | $ 1,589.4 |  |  |
Letters of credit outstanding, amount | 283.6 |  | 283.6 |  |  |
Asset retirement obligations | 665.8 |  | 665.8 |  |  | $ 654.1
Line of Credit Facility, Remaining Borrowing Capacity | 77.6 |  | 77.6 |  |  | 543.6
Net interest expense | 34.3 | $ 36.0 | 67.4 | $ 71.8 |  |
Provision for North Goonyella equipment loss | 0.0 | 0.0 | 0.0 | 24.7 | $ 66.4 |
Obligations [Member] |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Restricted Cash | 0.0 |  | 0.0 |  |  | 0.0
Accounts Receivable Securitization Program, April 1, 2022 [Member] |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 10.5 |  | 10.5 |  |  |
Secured Debt | Accounts Receivable Securitization Program, April 1, 2022 [Member] |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Letters of credit outstanding, amount | 0.0 |  | 0.0 |  |  |
Letters of credit issued, amount | 84.2 |  | 84.2 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250.0 |  | 250.0 |  |  |
Cash collateral required | 0.0 |  | 0.0 |  |  | $ 0.0
Net interest expense | 0.8 | $ 1.0 | 1.5 | $ 2.6 |  |
U.S Mining |  |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |  |
Surety Bonds outstanding | 1,398.9 |  | 1,398.9 |  |  |
Letters of credit outstanding, amount | 185.4 |  | 185.4 |  |  |
Asset retirement obligations | $ 757.5 |  | $ 757.5 |  |  |

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