Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

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

		September 30, 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		4.3		2.4		6.7		3.9		2.8
Permits	22	31.7		1.4		30.3		31.7		0.3		31.4
Other	30	1.6		—		1.6		—		—		—
Total		$	40.0	$	5.7	$	34.3	$	46.1	$	11.4	$	34.7