Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

At September 30, 2018, future minimum lease payments required under operating leases having initial or remaining non-cancellable lease terms for the next five years are as follows:

(dollars in millions)
Three months ended December 31, 2018	$	2.3
2019	7.9
2020	6.4
2021	4.2
2022	3.2
Thereafter	24.2
Total	$	48.2

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following table presents the activity for the Company’s asset retirement obligations:

	September 30,
(dollars in millions)	2018
Balance, beginning of period	$	2.3
Liabilities assumed in purchase accounting	6.6
Accretion expense	0.1
Balance, end of period	$	9.0