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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Summary of Inventories
The following is a summary of inventories at December 31:
($ in millions)
2018
 
2017
Raw materials
$
90.4

 
$
88.6

Work in process
42.2

 
31.8

Finished goods
81.9

 
94.8

 
$
214.5

 
$
215.2