Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets, net, include Goodwill allocated to our Domestic Coke segment of $3.4 million at both September 30, 2021 and December 31, 2020, and other intangibles detailed in the table below, excluding fully amortized intangible assets.

		September 30, 2021						December 31, 2020
	Weighted - Average Remaining Amortization Years	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
		(Dollars in millions)
Customer relationships	3	$	6.7	$	4.9	$	1.8	$	6.7	$	4.5	$	2.2
Permits	21	31.7		2.8		28.9		31.7		1.7		30.0
Other	29	1.6		—		1.6		1.6		—		1.6
Total		$	40.0	$	7.7	$	32.3	$	40.0	$	6.2	$	33.8