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

($ in millions)
2015
2014
Raw materials
$
74.4

$
79.9

Work in process
30.1

25.6

Finished goods
76.6

76.0

 
$
181.1

$
181.5