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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Guarantee Obligations [Line Items] |  |  |  |  |
Surety Bonds outstanding | $ 1,599.3 |  | $ 1,599.3 |  |
Letters of credit outstanding, amount | 200.5 |  | 200.5 |  |
Asset retirement obligations | 696.2 |  | 696.2 |  | $ 686.4
Net interest expense | 35.4 | $ 38.2 | 107.2 | $ 112.8 |
Net impact on collateral requirements |  |  | 0.0 | 323.1 |
Provision for North Goonyella equipment loss | 0.0 | 49.3 | 24.7 | 49.3 | 66.4
Proceeds from Release of Collateral, Short-term and Long-term |  |  |  | 363.2 |
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 | 132.7 |  | 132.7 |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250.0 |  | 250.0 |  |
Cash collateral required | 0.0 |  | 0.0 |  | $ 0.0
Net interest expense | 1.0 | $ 1.7 | 3.6 | $ 5.5 |
U.S Mining |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Surety Bonds outstanding | 1,394.9 |  | 1,394.9 |  |
Letters of credit outstanding, amount | 106.1 |  | 106.1 |  |
Asset retirement obligations | $ 760.0 |  | $ 760.0 |  |

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