Derivatives - Summary of Gross Fair Values of Derivative Instruments, Presenting the Impact of Offsetting Derivative Assets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 33.1	$ 3.2
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(6.6)	(2.3)
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	26.5	0.9
Gasoline Crack Spread Swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	18.1	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	18.1	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	0.0	0.0
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	(6.2)	(1.3)
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(6.2)	(1.3)
Diesel crack spread swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	10.8	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	10.8	0.4
2-1-1- Crack Spread Swap
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	0.4
2-1-1- Crack Spread Swap | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0.4	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		0.5
Natural Gas Swaps [Member] | Not Designated as Hedging Instrument [Member] | Specialty Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0.1	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	(0.3)	0.0
Inventory Financing Obligations | Not Designated as Hedging Instrument [Member] | Fuel Product [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	3.7	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	3.7	0.0
Fair Value, Measurements, Recurring
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	26.5	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	18.1	1.3
Fair Value, Measurements, Recurring | Inventory Financing Obligations
Offsetting Assets [Line Items]
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	(3.7)	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	(6.2)	(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	10.8	0.4
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	0.4	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	(0.3)	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	26.5	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	18.1	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	3.7	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	(6.2)	(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	10.8	0.4
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	0.4	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	(0.3)	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] | 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 | 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