Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Measurements

Schedule of hierarchy of recurring fair value measurements

The Company’s recurring assets and liabilities measured at fair value were as follows (in millions):

	December 31, 2024								December 31, 2023
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets:
Derivative assets:
Crack spread swaps	$	—	$	—	$	—	$	—	$	—	$	—	$	11.6	$	11.6
Inventory financing obligation		—		—		5.7		5.7		—		—		—		—
Total derivative assets	$	—	$	—	$	5.7	$	5.7	$	—	$	—	$	11.6	$	11.6
Pension plan investments	$	3.7	$	22.2	$	—	$	25.9	$	3.5	$	23.5	$	—	$	27.0
Total recurring assets at fair value	$	3.7	$	22.2	$	5.7	$	31.6	$	3.5	$	23.5	$	11.6	$	38.6
Liabilities:
Derivative liabilities:
Inventory financing obligation	$	—	$	—	$	—	$	—	$	—	$	—	$	(52.5)	$	(52.5)
Total derivative liabilities	$	—	$	—	$	—	$	—	$	—	$	—	$	(52.5)	$	(52.5)
Precious metals obligations		(5.2)		—		—		(5.2)		(6.9)		—		—		(6.9)
Liability awards		(67.8)		—		—		(67.8)		(64.2)		—		—		(64.2)
Total recurring liabilities at fair value	$	(73.0)	$	—	$	—	$	(73.0)	$	(71.1)	$	—	$	(52.5)	$	(123.6)

Summary of net changes in fair value of the Company's Level 3 financial assets and liabilities

The table below sets forth a summary of net changes in fair value of the Company’s Level 3 financial assets and liabilities (in millions):

	For the Year Ended December 31,
	2024		2023
Fair value at January 1,	$	(40.8)	$	(73.8)
Realized loss on derivative instruments		(37.8)		(23.1)
Unrealized gain on derivative instruments		47.1		33.0
Settlements		37.8		23.1
Fair value at December 31,	$	6.3	$	(40.8)
Total gain (loss) included in net income (loss) attributable to changes in unrealized gain (loss) relating to financial assets and liabilities held as of December 31,	$	47.1	$	33.0

Carrying value and estimated fair value of the Company's financial instruments, carried at adjusted historical cost

The Company’s carrying value and estimated fair value of the Company’s financial instruments, carried at adjusted historical cost, were as follows (in millions):

	December 31, 2024					December 31, 2023
	Level	Fair Value		Carrying Value		Fair Value		Carrying Value
Financial Instrument:
2024 Secured Notes, 2025 Notes, 2026 Notes, 2027 Notes, 2028 Notes, and 2029 Secured Notes	2	$	1,218.3	$	1,196.7	$	1,247.2	$	1,232.3
Revolving credit facility	3	$	286.6	$	283.6	$	136.7	$	134.4
MRL revolving credit agreement	3	$	—	$	(0.3)	$	13.0	$	12.4
MRL term loan credit agreement	3	$	73.7	$	71.4	$	74.4	$	71.6
Shreveport terminal asset financing arrangement	3	$	42.1	$	41.6	$	50.8	$	50.1
Montana terminal asset financing arrangement	3	$	30.4	$	30.2	$	—	$	—
Montana refinery asset financing arrangement	3	$	108.7	$	108.7	$	—	$	—
MRL asset financing arrangements	3	$	368.1	$	365.4	$	384.6	$	381.6
Finance leases and other obligations	3	$	2.9	$	2.9	$	3.0	$	3.0