Derivatives - Schedule of Derivative Instruments (Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	$ 12.5	$ 22.5	$ 19.4	$ 34.2
Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	(1.2)	(12.2)	30.4	(14.8)
Natural Gas Swaps [Member] | Specialty Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	(0.5)	0.0	(0.6)	0.0
Natural Gas Swaps [Member] | Specialty Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.1	0.0	(0.2)	0.0
WCS crude oil basis swaps | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	4.6	13.5	4.6	17.1
WCS crude oil basis swaps | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	12.3	(11.4)	6.1	(14.9)
WCS crude oil percentage basis swap | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	0.8	0.0	0.9
WCS crude oil percentage basis swap | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	(0.9)	0.0	6.3
Midland crude oil basis swap purchases [Member] | Specialty Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	0.5	0.0	1.6
Midland crude oil basis swap purchases [Member] | Specialty Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	(0.5)	0.0	(1.0)
Midland crude oil basis swap purchases [Member] | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	1.7	0.0	9.0
Midland crude oil basis swap purchases [Member] | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	(5.0)	0.0	(7.1)
Gasoline Crack Spread Swaps | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	3.4	0.0	5.5	0.0
Gasoline Crack Spread Swaps | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	(13.5)	0.0	3.3	0.0
2-1-1- Crack Spread Swap | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.2	0.0	2.1	0.0
2-1-1- Crack Spread Swap | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	(0.4)	0.0	(0.5)	0.0
Diesel crack spread swaps | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	4.8	5.4	7.8	6.1
Diesel crack spread swaps | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	(1.3)	(6.6)	9.1	(7.4)
Diesel percentage basis crack spread swaps | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	0.6	0.0	(0.5)
Diesel percentage basis crack spread swaps | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	(3.3)	0.0	6.5
Diesel-MEH crack spread swap [Member] [Domain] | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	0.0	0.0	0.0
Diesel-MEH crack spread swap [Member] [Domain] | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.9	0.0	0.9	0.0
Inventory Financing Obligations | Fuel Product [Member] | Realized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	0.0	0.0	0.0	0.0
Inventory Financing Obligations | Fuel Product [Member] | Unrealized Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss)	$ 0.7	$ 15.5	$ 11.7	$ 2.8