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Property, Plant And Equipment
 12 Months Ended
Dec. 31, 2021
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):
20212020
Land and improvements$10.7 $16.9 
Buildings and improvements168.7 148.8 
Machinery, equipment and other assets354.5 342.8 
Construction in progress45.6 84.8 
Gross property, plant and equipment579.5 593.3 
Less: accumulated depreciation(315.4)(318.7)
Property, plant and equipment, net$264.1 $274.6