Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Accounting Policies [Abstract]

Schedule of Property, Plant and Equipment

Depreciation is computed using the straight-line method over management's estimated useful lives of the related assets, which are as follows:

	Years
Building and building improvements	15-40
Refinery machinery and equipment	5-40
Pipelines and terminals	10-40
Refinery turnaround costs	4-6
Automobiles	3-10
Computer equipment and software	3-10
Furniture and fixtures	5-15

Property, plant and equipment, at cost, consist of the following (in millions):

	December 31,
	2024		2023
Land	$	41.2	$	31.1
Building and building improvements	53.4		54.7
Refinery machinery and equipment	2,349.1		2,260.1
Pipelines and terminals	1,454.1		1,224.8
Refinery turnaround costs	526.6		538.8
Other equipment	187.6		171.8
Construction in progress	336.4		179.0
	$	4,948.4	$	4,460.3
Less: accumulated depreciation	(2,008.4)		(1,764.0)
	$	2,940.0	$	2,696.3