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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
A summary of gross property, plant and equipment at December 31 is presented in the following table:

($ in millions)Expected useful lives (years)20202019
Land$24.8 $22.1 
Buildings and improvements
15-35
618.1 572.9 
Machinery and equipment
5-12
911.8 817.0 
Molds and dies
4-7
131.2 123.8 
Computer hardware and software
3-10
157.5 155.6 
Construction in progress192.1 128.7 
$2,035.5 $1,820.1