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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Guarantee Obligations [Line Items] |  |  |  |  |
Surety Bonds outstanding | $ 1,572.0 |  | $ 1,572.0 |  |
Letters of credit outstanding, amount | 202.2 |  | 202.2 |  |
Asset retirement obligations | 698.9 |  | 698.9 |  | $ 686.4
Net interest expense | 36.0 | $ 38.3 | 71.8 | $ 74.6 |
Net impact on collateral requirements |  |  | 0.0 | 323.1 |
Provision for North Goonyella equipment loss | 0.0 | 0.0 | 24.7 | 0.0 | $ 66.4
Proceeds from Release of Collateral, Short-term and Long-term |  |  |  | 363.2 |
Secured Debt | Accounts Receivable Securitization Program, April 3, 2020 |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250.0 |  | 250.0 |  |
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 | 129.9 |  | 129.9 |  |
Cash collateral required | 0.0 |  | 0.0 |  |
Net interest expense | 1.0 | $ 1.9 | 2.6 | $ 3.8 |
U.S Mining |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Surety Bonds outstanding | 1,359.9 |  | 1,359.9 |  |
Letters of credit outstanding, amount | 110.5 |  | 110.5 |  |
Asset retirement obligations | $ 762.8 |  | $ 762.8 |  |

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