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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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