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Property, Plant And Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant And Equipment PROPERTY, PLANT AND EQUIPMENT
The classes of property, plant and equipment as of December 31 are summarized as follows ($ in millions):
20222021
Land and improvements$10.0 $10.7 
Buildings and improvements154.5 168.7 
Machinery, equipment and other assets370.2 354.5 
Construction in progress71.2 45.6 
Gross property, plant and equipment605.9 579.5 
Less: accumulated depreciation(312.3)(315.4)
Property, plant and equipment, net$293.6 $264.1