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Financial Instruments and Other Guarantees - Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Guarantee Obligations [Line Items] |  |  |  |
Surety Bonds outstanding | $ 1,557.4 |  |  |
Letters of credit outstanding, amount | 206.8 |  |  |
Asset retirement obligations | 666.6 |  |  | $ 654.1
Net interest expense | 33.1 | $ 35.8 |  |
Provision for North Goonyella equipment loss | 0.0 | 24.7 | $ 66.4 |
Accounts Receivable Securitization Program, April 1, 2022 [Member] |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 12.8 |  |  |
Secured Debt | Accounts Receivable Securitization Program, April 1, 2022 [Member] |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Letters of credit outstanding, amount | 0.0 |  |  |
Letters of credit issued, amount | 132.7 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250.0 |  |  |
Cash collateral required | 0.0 |  |  | $ 0.0
Net interest expense | 0.7 | $ 1.1 |  |
U.S Mining |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Surety Bonds outstanding | 1,365.0 |  |  |
Letters of credit outstanding, amount | 111.1 |  |  |
Asset retirement obligations | $ 758.7 |  |  |

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