Derivatives - Summary of Gross Fair Values of Derivative Instruments, Presenting the Impact of Offsetting Derivative Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 24.8	$ 3.2
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(0.7)	(2.3)
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	24.1	0.9
Gasoline Crack Spread Swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	4.6	1.8
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	(0.5)
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.6	1.3
WCS crude oil basis swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	5.2	0.0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(0.3)	(1.3)
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.9	(1.3)
Diesel crack spread swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	9.5	0.9
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	(0.5)
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	9.5	0.4
Diesel-MEH crack spread swap [Member] [Domain] | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0.9	0.0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.9	0.0
2-1-1- Crack Spread Swap | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0.0	0.5
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.5
Natural Gas Swaps [Member] | Not Designated as Hedging Instrument [Member] | Specialty Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0.2	0.0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(0.4)	0.0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(0.2)	0.0
Inventory Financing Obligations | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	4.4	0.0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0.0	0.0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.4	0.0
Fair Value, Measurements, Recurring
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	24.1	0.9
Fair Value, Measurements, Recurring | Gasoline Crack Spread Swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.6	1.3
Fair Value, Measurements, Recurring | Inventory Financing Obligations
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(4.4)	0.0
Fair Value, Measurements, Recurring | WCS crude oil basis swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.9	(1.3)
Fair Value, Measurements, Recurring | Diesel crack spread swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	9.5	0.4
Fair Value, Measurements, Recurring | Diesel-MEH crack spread swap [Member] [Domain]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.9	0.0
Fair Value, Measurements, Recurring | 2-1-1- Crack Spread Swap
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.5
Fair Value, Measurements, Recurring | Natural Gas Swaps [Member]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(0.2)	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	24.1	0.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Gasoline Crack Spread Swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.6	1.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Inventory Financing Obligations
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(4.4)	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | WCS crude oil basis swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	4.9	(1.3)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Diesel crack spread swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	9.5	0.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Diesel-MEH crack spread swap [Member] [Domain]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.9	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | 2-1-1- Crack Spread Swap
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Natural Gas Swaps [Member]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(0.2)	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | Gasoline Crack Spread Swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | Inventory Financing Obligations
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | WCS crude oil basis swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | Diesel crack spread swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | Diesel-MEH crack spread swap [Member] [Domain]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | 2-1-1- Crack Spread Swap
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps [Member]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Gasoline Crack Spread Swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Inventory Financing Obligations
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | WCS crude oil basis swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Diesel crack spread swaps
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Diesel-MEH crack spread swap [Member] [Domain]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | 2-1-1- Crack Spread Swap
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Natural Gas Swaps [Member]
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	$ 0.0	$ 0.0