Intangible Assets

9 Months Ended

Sep. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

3. Intangible Assets

Intangible assets, net, include Goodwill allocated to our Domestic Coke segment of $3.4 million at both September 30, 2024 and December 31, 2023, and other intangibles detailed in the table below, excluding fully amortized intangible assets.

		September 30, 2024						December 31, 2023
	Weighted - Average Remaining Amortization Years	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
		(Dollars in millions)
Customer relationships	0	$	6.7	$	6.7	$	—	$	6.7	$	6.2	$	0.5
Permits	18	31.7		6.9		24.8		31.7		5.9		25.8
Other	26	1.6		0.2		1.4		1.6		0.2		1.4
Total		$	40.0	$	13.8	$	26.2	$	40.0	$	12.3	$	27.7

Total amortization expense for intangible assets subject to amortization was $0.5 million for both the three months ended September 30, 2024 and 2023, and $1.5 million and $1.6 million for the nine months ended September 30, 2024 and 2023, respectively.