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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Summary of Inventories
The following is a summary of inventories at December 31:
($ in millions)
2016
2015
Raw materials
$
78.0

$
74.4

Work in process
28.9

30.1

Finished goods
92.4

76.6

 
$
199.3

$
181.1