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Commitments and Contingencies - Refinery Turnaround Project (Details) - Refinery Turnaround Project - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Jun. 30, 2024
Commitments and Contingencies
Amount of work outside original contract				$ 90.0
Payment entitled to				$ 144.0
Construction lien against the refinery for unpaid labor and materials costs		$ 132.0
A Refinery in Montana
Commitments and Contingencies
Damages sought, counter party	$ 93.0		$ 79.0

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