Derivatives - Summary of Gross Fair Values of Derivative Instruments, Presenting the Impact of Offsetting Derivative Assets (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Offsetting Assets [Line Items] | | |
Gross Amounts of Recognized Assets | $ 15 | $ 3.2 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | (0.1) | (2.3) |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 14.9 | 0.9 |
Gasoline Crack Spread Swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member] | | |
Offsetting Assets [Line Items] | | |
Gross Amounts of Recognized Assets | 0.8 | 1.8 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | (0.5) |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 0.8 | 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 | 4.3 | 0 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | (0.1) | (1.3) |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 4.2 | (1.3) |
Diesel crack spread swaps | Not Designated as Hedging Instrument [Member] | Fuel Product [Member] | | |
Offsetting Assets [Line Items] | | |
Gross Amounts of Recognized Assets | 5.9 | 0.9 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | (0.5) |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 5.9 | 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 | 1.6 | 0 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | 0 |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 1.6 | 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 | 0.5 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | 0 |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 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 | 0.1 | 0 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | 0 |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 0.1 | 0 |
Natural Gas Swaps [Member] | Not Designated as Hedging Instrument [Member] | Fuel Product [Member] | | |
Offsetting Assets [Line Items] | | |
Gross Amounts of Recognized Assets | 0.4 | 0 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | 0 |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 0.4 | 0 |
Inventory Financing Obligations | Not Designated as Hedging Instrument [Member] | Fuel Product [Member] | | |
Offsetting Assets [Line Items] | | |
Gross Amounts of Recognized Assets | 1.9 | 0 |
Gross Amounts Offset in the Condensed Consolidated Balance Sheets | 0 | 0 |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 1.9 | 0 |
Fair Value, Measurements, Recurring | | |
Offsetting Assets [Line Items] | | |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 14.9 | 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 | 0.8 | 1.3 |
Fair Value, Measurements, Recurring | Inventory Financing Obligations | | |
Offsetting Assets [Line Items] | | |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | (1.9) | 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 | 4.2 | (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 | 5.9 | 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 | 1.6 | 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 | 0.5 |
Fair Value, Measurements, Recurring | Natural Gas Swaps [Member] | | |
Offsetting Assets [Line Items] | | |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 0.5 | 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 | 14.9 | 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 | 0.8 | 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 | (1.9) | 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 | 4.2 | (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 | 5.9 | 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 | 1.6 | 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 | 0.5 |
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 | 0.5 | 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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
Fair Value, Measurements, Recurring | Level 2 | | |
Offsetting Assets [Line Items] | | |
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets | 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 |
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 |
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 |
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 |
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 |
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 |
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 |