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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Other Assets [Abstract]  
Schedule of Other Assets
Other assets consisted of the following ($ in millions):
 
December 31,
 
2017
 
2016
Capitalized software costs, net of accumulated amortization
$
7.4

 
$
4.4

Business tax credits, including VAT and ICMS (net of $10.6 million and $11.5 million reserve as of December 31, 2017 and 2016, respectively)
2.4

 
2.5

Grantor trust assets
12.2

 
10.3

Net pension assets
4.6

 
—

Long-term supplies inventory
7.0

 
6.0

Other assets
5.9

 
4.3

Total
$
39.5

 
$
27.5