Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [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
Retail store equipment and site improvements	7-40
Refinery turnaround costs	4-6
Automobiles	3-10
Computer equipment and software	3-10
Furniture and fixtures	5-15
Asset retirement obligation assets	15-50

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

	December 31,
	2023		2022
Land	$	61.8	$	60.0
Building and building improvements	129.1		110.4
Refinery machinery and equipment	2,260.1		2,095.4
Pipelines and terminals	1,224.8		1,103.9
Retail store equipment and site improvements	96.5		77.8
Refinery turnaround costs	538.8		485.3
Other equipment	187.8		169.4
Construction in progress	191.8		246.8
	$	4,690.7	$	4,349.0
Less: accumulated depreciation	(1,845.5)		(1,572.6)
	$	2,845.2	$	2,776.4