Commitments and Contingencies - Estimated Future Payments of Environmental Obligations (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
2024		$ 1.5
2025		1.5
2026		1.6
2027		1.6
2028		1.6
Thereafter		31.2
Discounted environmental liabilities, gross		39.0
Less: Discount applied		$ 3.0
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Accrued Environmental Loss Contingencies, Noncurrent
Discounted environmental liabilities		$ 36.0	$ 36.7
RINs inventory true-up adjustment	$ (12.3)

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of imputed interest necessary to reduce (reconcile) the undiscounted amount of the accrual for environmental loss contingencies to the present value.

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Undiscounted amount of the accrual for environmental loss contingencies.

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Undiscounted amount of accrual for environmental loss contingency to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Undiscounted amount of accrual for environmental loss contingency to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Undiscounted amount of accrual for environmental loss contingency to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Undiscounted amount of accrual for environmental loss contingency to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Undiscounted amount of accrual for environmental loss contingency to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Undiscounted amount of accrual for environmental loss contingency to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Indicates line item in statement of financial position that includes accrual for environmental loss contingency.

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