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Derivatives and Fair Value Measurements Derivatives by Balance Sheet Classification (Details) - Successor - Designated as Hedging Instrument - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Asset Derivative |  |
Asset derivatives, gross | $ 67.5 | $ 132.0
Effect of counterparty netting, derivative assets | (64.5) | (125.2)
Variation margin posted on derivative assets | 0.0 | 0.0
Net derivative assets and margin as classified in the balance sheets | 3.0 | 6.8
Liability Derivative |  |
Liability derivatives, gross | (87.5) | (172.8)
Effect of counterparty netting, derivative liabilities | 64.5 | 125.2
Variation margin posted on derivative liabilities | 21.8 | 35.8
Net derivative liabilities and margin as classified in the balance sheets | (1.2) | (11.8)
Foreign currency option contracts |  |
Asset Derivative |  |
Asset derivatives, gross | 1.2 | 4.2
Liability Derivative |  |
Liability derivatives, gross | 0.0 | 0.0
Coal contracts related to forecasted sales |  |
Asset Derivative |  |
Asset derivatives, gross | 6.6 | 8.4
Liability Derivative |  |
Liability derivatives, gross | (23.1) | (46.1)
Coal trading contracts |  |
Asset Derivative |  |
Asset derivatives, gross | 59.7 | 119.4
Liability Derivative |  |
Liability derivatives, gross | $ (64.4) | $ (126.7)

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