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Intangible Assets

6 Months Ended

Jun. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

3. Intangible Assets

Intangible assets, net, include Goodwill allocated to our Domestic Coke segment of $3.4 million at both June 30, 2023 and December 31, 2022, and other intangibles detailed in the table below, excluding fully amortized intangible assets.


		June 30, 2023						December 31, 2022
	Weighted - Average Remaining Amortization Years	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net

		(Dollars in millions)
Customer relationships	1	$	6.7	$	5.9	$	0.8	$	6.7	$	5.6	$	1.1
Permits	19	31.7		5.2		26.5		31.7		4.5		27.2
Other	27	1.6		0.2		1.4		1.6		0.1		1.5
Total		$	40.0	$	11.3	$	28.7	$	40.0	$	10.2	$	29.8

Total amortization expense for intangible assets subject to amortization was $0.6 million and $0.5 million for the three months ended June 30, 2023 and 2022, respectively, and $1.1 million and $1.0 million for the six months ended June 30, 2023 and 2022, respectively.