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Derivatives and Fair Value Measurements Texuals (Details) T in Millions, $ in Millions, $ in Millions | Dec. 31, 2020 T | Sep. 30, 2020 $ / $ | Dec. 31, 2019 USD ($) T | Dec. 31, 2019 AUD ($) T | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Coal Trading |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  | $ 22.1 |  | $ 21.8
Derivative, Collateral, Right to Reclaim Cash |  |  | 7.9 |  | 16.7
Receivables from Brokers-Dealers and Clearing Organizations |  |  | 1.3 |  | 2.2
Potential collateralization that may be requested by counterparties due to a material adverse event |  |  | $ 0.0 |  | $ 1.3
External Credit Rating, Investment Grade | Coal Trading Positions | Credit Concentration Risk | Coal Trading |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Credit Exposure Related to Coal Trading Activities |  |  | 91.00% | 91.00% |
Non Rated | Coal Trading Positions | Credit Concentration Risk | Coal Trading |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Credit Exposure Related to Coal Trading Activities |  |  | 9.00% | 9.00% |
Foreign currency option contracts |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 925.0 |
Foreign currency option contracts |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 0.0 |
Coal |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T |  |  | 2.0 | 2.0 |
Diesel Fuel Hedge Contracts |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Interest Rate Derivatives, at Fair Value, Net |  |  |  | $ 0.0 |
Scenario, Forecast | Foreign currency option contracts | Minimum |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  | 0.73 |  |  |
Scenario, Forecast | Foreign currency option contracts | Maximum |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Exchange Rate Cap | $ / $ |  | 0.75 |  |  |
Scenario, Forecast | Coal |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount | T | 1.7 |  |  |  |

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