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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Summary of Inventories The following is a summary of inventories at December 31:
($ in millions)20212020
Raw materials$153.8 $133.5 
Work in process63.5 54.9 
Finished goods161.1 132.9 
$378.4 $321.3