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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of Inventories The following is a summary of inventories at December 31:
($ in millions)20192018
Raw materials$100.9  $90.4  
Work in process37.4  42.2  
Finished goods97.4  81.9  
$235.7  $214.5