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Derivatives - Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Due from affiliates	$ 17.8	$ 30.1
Due from affiliates - less current portion	5.1	0.5
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative asset	58.3	19.7
Derivative liability	39.3	4.2
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Derivative [Line Items]
Derivative asset	58.3	19.7
Derivative liability	37.7	3.6
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative asset	0.0	0.0
Derivative liability	1.6	0.6
Glencore [Member] | Commodity Contract [Member]
Derivative [Line Items]
Due from affiliates	8.1	0.2
Due from affiliates - less current portion	$ 5.1	$ 0.5

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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