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Committments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
At December 31, 2017, future minimum annual rent commitments are as follows:
 
Dollar amounts in millions
 
Year ended December 31,
 
2018
$
2.7

2019
2.7

2020
1.9

2021
1.9

2022
1.0

2023 and thereafter

Total
$
10.2