Derivatives - Not Designated as Hedges (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Realized Gain (Loss)
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (3.5)	$ 1.6	$ (13.5)	$ (42.7)
Realized Gain (Loss) | Specialty Products and Solutions | Inventory financing obligation
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(3.5)	(2.8)	(7.9)	(60.5)
Realized Gain (Loss) | Specialty Products and Solutions | Crack spread swaps
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		6.0		13.5
Realized Gain (Loss) | Montana/Renewables | Inventory financing obligation
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		(1.6)	(5.6)	4.3
Unrealized Gain (Loss)
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	2.0	13.6	9.1	52.3
Unrealized Gain (Loss) | Specialty Products and Solutions | Inventory financing obligation
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 2.0	17.3	$ 9.1	63.9
Unrealized Gain (Loss) | Specialty Products and Solutions | Crack spread swaps
Derivative instruments not designated as cash flow hedges
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		$ (3.7)		$ (11.6)