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Derivatives and Fair Value Measurements - Derivatives by Balance Sheet Classification (Details) - Designated as Hedging Instrument - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Asset Derivative |  |
Total derivatives | $ 223.1 | $ 67.5
Effect of counterparty netting | (171.8) | (64.5)
Variation margin (held) posted | (46.1) | 0.0
Net derivatives and margin as classified in the balance sheets | 5.2 | 3.0
Liability Derivative |  |
Total derivatives | (171.8) | (87.5)
Effect of counterparty netting | 171.8 | 64.5
Variation margin (held) posted | 0.0 | 21.8
Net derivatives and margin as classified in the balance sheets | 0.0 | (1.2)
Foreign currency option contracts |  |
Asset Derivative |  |
Foreign currency option contracts | 1.2 | 1.2
Liability Derivative |  |
Foreign currency option contracts | 0.0 | 0.0
Coal contracts related to forecasted sales |  |
Asset Derivative |  |
Coal contracts related to forecasted sales | 34.7 | 6.6
Liability Derivative |  |
Coal contracts related to forecasted sales | (3.7) | (23.1)
Coal trading contracts |  |
Asset Derivative |  |
Coal trading contracts | 187.2 | 59.7
Liability Derivative |  |
Coal trading contracts | $ (168.1) | $ (64.4)

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