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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Summary of Inventories
The following is a summary of inventories at December 31:
($ in millions)
2017
 
2016
Raw materials
$
88.6

 
$
78.0

Work in process
31.8

 
28.9

Finished goods
94.8

 
92.4

 
$
215.2

 
$
199.3