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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment (and related depreciable lives) consisted of the following ($ in millions):
December 31,
20202019
Land and improvements$13.6 $14.8 
Buildings and improvements (20 to 40 years or remaining life of relevant lease)
144.0 142.3 
Machinery and equipment (5 to 20 years)
524.4 622.6 
Construction in progress23.1 24.0 
Gross property, plant and equipment705.1 803.7 
Less: Accumulated depreciation366.1 473.4 
Property, plant and equipment, net$339.0 $330.3