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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
Land and improvements
$
15.0

 
$
15.3

Buildings and improvements (20 to 40 years or remaining life of relevant lease)
142.0

 
145.1

Machinery and equipment (5 to 20 years)
620.9

 
621.9

Construction in progress
14.6

 
28.1

Gross property, plant and equipment
792.5

 
810.4

Less: Accumulated depreciation
452.2

 
448.5

Property, plant and equipment, net
$
340.3

 
$
361.9