Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]


	Domestic Coke		Logistics		Total
	(Dollars in millions)
Net balances at December 31, 2018	$	3.4	$	73.5	$	76.9
Impairment	—		(73.5)		(73.5)
Net balances at December 31, 2019 and 2020	$	3.4	$	—	$	3.4

Schedule of Finite-Lived Intangible Assets

The components of other intangible assets, net, excluding fully amortized intangible assets, were as follows:


		December 31, 2020						December 31, 2019
	Weighted - Average Remaining Amortization Years	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
		(Dollars in millions)
Customer contracts	—	$	—	$	—	$	—	$	7.7	$	7.2	$	0.5
Customer relationships	4	6.7		4.5		2.2		6.7		3.9		2.8
Permits	22	31.7		1.7		30.0		31.7		0.3		31.4
Other	30	1.6		—		1.6		—		—		—
Total		$	40.0	$	6.2	$	33.8	$	46.1	$	11.4	$	34.7

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Based on the carrying value of finite-lived intangible assets as of December 31, 2020, we estimate amortization expense for each of the next five years as follows:


	(Dollars in millions)
2021	$	2.0
2022	2.0
2023	2.0
2024	1.9
2025	1.5
Thereafter	24.4
Total	$	33.8