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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
At December 31, 2016, 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)
 
2017
$
4.1

2018
2.9

2019
2.6

2020
2.3

2021
2.2

Thereafter
19.8

Total
$
33.9
Schedule of Change in Asset Retirement Obligation [Table Text Block]
The following table presents the activity for the Company’s asset retirement obligations, which are included in "Other noncurrent liabilities" in the Consolidated Balance Sheets:
 
December 31,
(dollars in millions)
2016
 
2015
Balance, beginning of period
$
4.8

 
$
1.6

Asset retirement obligations reclassified from discontinued operations
—

 
10.9

Liabilities settled
(2.0
)
 
(5.0
)
Revision to estimated cash flow
(1.1
)
 
(2.9
)
Accretion expense
0.1

 
0.2

Balance, end of period
$
1.8

 
$
4.8