Derivatives - Summary of Gross Fair Values of Derivative Instruments, Presenting the Impact of Offsetting Derivative Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ (0.7)	$ (9.5)
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.7	2.3
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	0.0	(7.2)
Natural Gas Swaps [Member] \| Specialty Product [Member] \| Not Designated as Hedging Instrument [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	(0.4)	0.0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.4	0.0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Diesel crack spread swaps \| Fuel Product [Member] \| Not Designated as Hedging Instrument [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0.0	(0.5)
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	0.5
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Gasoline Crack Spread Swaps \| Fuel Product [Member] \| Not Designated as Hedging Instrument [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0.0	(0.5)
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	0.5
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
WCS crude oil basis swaps \| Fuel Product [Member] \| Not Designated as Hedging Instrument [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	(0.3)	(1.3)
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.3	1.3
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Inventory Financing Obligations \| Fuel Product [Member] \| Not Designated as Hedging Instrument [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0.0	(7.2)
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	0.0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets	$ 0.0	$ (7.2)

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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Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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