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Derivatives and Fair Value Measurements - Derivatives by Balance Sheet Classification (Details) - Designated as Hedging Instrument - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Asset Derivative |  |
Total derivatives | $ 94.7 | $ 102.3
Effect of counterparty netting | (62.0) | (74.3)
Variation margin (held) posted | (23.8) | (22.1)
Net derivatives and margin as classified in the balance sheets | 8.9 | 5.9
Liability Derivative |  |
Total derivatives | (62.0) | (74.3)
Effect of counterparty netting | 62.0 | 74.3
Variation margin (held) posted | 0.0 | 0.0
Net derivatives and margin as classified in the balance sheets | 0.0 | 0.0
Foreign currency option contracts |  |
Asset Derivative |  |
Foreign currency option contracts | 3.6 | 1.1
Liability Derivative |  |
Foreign currency option contracts | 0.0 | 0.0
Coal contracts related to forecasted sales |  |
Asset Derivative |  |
Coal contracts related to forecasted sales | 23.8 | 20.1
Liability Derivative |  |
Coal contracts related to forecasted sales | 0.0 | (0.1)
Coal trading contracts |  |
Asset Derivative |  |
Coal trading contracts | 67.3 | 81.1
Liability Derivative |  |
Coal trading contracts | $ (62.0) | $ (74.2)

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