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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Summary of Inventories The following is a summary of inventories at December 31:
($ in millions)20202019
Raw materials$133.5 $100.9 
Work in process54.9 37.4 
Finished goods132.9 97.4 
$321.3 $235.7