Properties, Plants and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Schedule of Components of Net Properties, Plants and Equipment

The components of net properties, plants and equipment were as follows:

	December 31,
	2023		2022
	(Dollars in millions)
Coke and energy plant, machinery and equipment	$	2,193.9	$	2,134.9
Logistics plant, machinery and equipment	181.2		176.6
Land and land improvements	110.0		106.8
Construction-in-progress	43.3		40.7
Other	46.3		46.3
Gross investment, at cost	2,574.7		2,505.3
Less: accumulated depreciation	(1,383.6)		(1,276.0)
Total properties, plants and equipment, net	$	1,191.1	$	1,229.3